A pedestrian walks outside of the NASA headquarters, as administrator Jim Bridenstine announced today the agency's headquarters building will be named after Mary W. Jackson, the first African American female engineer at NASA, in Washington, U.S., June 24, 2020. REUTERS/Tom Brenner 

A traffic cone sits on a sidewalk outside of the NASA headquarters, as administrator Jim Bridenstine announced today the agency's headquarters building will be named after Mary W. Jackson, the first African American female engineer at NASA, in Washington, U.S., June 24, 2020. REUTERS/Tom Brenner 

An exterior view of the NASA headquarters, as administrator Jim Bridenstine announced today the agency's headquarters building will be named after Mary W. Jackson, the first African American female engineer at NASA, in Washington, U.S., June 24, 2020. REUTERS/Tom Brenner 

An exterior view of the NASA headquarters, as administrator Jim Bridenstine announced today the agency's headquarters building will be named after Mary W. Jackson, the first African American female engineer at NASA, in Washington, U.S., June 24, 2020. REUTERS/Tom Brenner 

Powerball jackpot co-winners Lisa and John Robinson (L) of Munford, Tennessee and Tennessee Lottery President and CEO Rebecca Hargrove (R) attend a news conference at the headquarters of the Tennessee Lottery in Nashville, Tennessee January 15, 2016. The couple revealed on the TODAY television show that they held a winning ticket to claim their share of the $1.6 billion Powerball prize. REUTERS/Harrison McClary 

Powerball jackpot co-winners Lisa and John Robinson of Munford, Tennessee, their lawyer Joe Townsend and Tennessee Lottery President and CEO Rebecca Hargrove attend a news conference at the headquarters of the Tennessee Lottery in Nashville, Tennessee January 15, 2016. The couple revealed on the TODAY television show that they held a winning ticket to claim their share of the $1.6 billion Powerball prize. REUTERS/Harrison McClary 

Powerball jackpot co-winners Lisa and John Robinson of Munford, Tennessee, their daughter Tiffany Robinson (L) and Tennessee Lottery President and CEO Rebecca Hargrove attend a news conference at the headquarters of the Tennessee Lottery in Nashville, Tennessee January 15, 2016. The couple revealed on the TODAY television show that they held a winning ticket to claim their share of the $1.6 billion Powerball prize. REUTERS/Harrison McClary TPX IMAGES OF THE DAY

Powerball jackpot co-winners Lisa and John Robinson of Munford, Tennessee, their daughter Tiffany Robinson (L), dog Abby, their lawyer Joe Townsend and Tennessee Lottery President and CEO Rebecca Hargrove speak to the media at the headquarters of the Tennessee Lottery in Nashville, Tennessee January 15, 2016. The couple revealed on the TODAY television show that they held a winning ticket to claim their share of the $1.6 billion Powerball prize. REUTERS/Harrison McClary 

Powerball jackpot co-winners Lisa and John Robinson of Munford, Tennessee attend a news conference at the headquarters of the Tennessee Lottery in Nashville, Tennessee January 15, 2016. The couple revealed on the TODAY television show that they held a winning ticket to claim their share of the $1.6 billion Powerball prize. REUTERS/Harrison McClary 

Powerball jackpot co-winners Lisa and John Robinson of Munford, Tennessee, their daughter Tiffany Robinson (L), dog Abby, their lawyer Joe Townsend and Tennessee Lottery President and CEO Rebecca Hargrove speak to the media at the headquarters of the Tennessee Lottery in Nashville, Tennessee January 15, 2016. The couple revealed on the TODAY television show that they held a winning ticket to claim their share of the $1.6 billion Powerball prize. REUTERS/Harrison McClary 

Powerball jackpot co-winners Lisa and John Robinson of Munford, Tennessee, with their dog Abby, enter the news conference to speak to the media at the headquarters of the Tennessee Lottery in Nashville, Tennessee January 15, 2016. The couple revealed on the TODAY television show that they held a winning ticket to claim their share of the $1.6 billion Powerball prize. REUTERS/Harrison McClary 

Powerball jackpot co-winners Lisa and John Robinson of Munford, Tennessee speak to the media at the headquarters of the Tennessee Lottery in Nashville, Tennessee January 15, 2016. The couple revealed on the TODAY television show that they held a winning ticket to claim their share of the $1.6 billion Powerball prize. REUTERS/Harrison McClary 

A New York Police Department vessel and United States Coast Guard vessel can be seen patrolling the United Nations headquarters along the East River from inside the U.N. headquarters in Manhattan, New York September 29, 2015. U.S. President Barack Obama, U.S. Secretary of State John Kerry and U.S. Vice President Joe Biden were in attendance today for the Leaders' Summit on Countering ISIL and Violent Extremism. REUTERS/Darren Ornitz

Professor and activist Melina Abdullah comforts activist Shamble Bell during a news conference outside LAPD Headquarters in Los Angeles, California January 9, 2015. Los Angeles police Chief Charlie Beck agreed to meet today with a delegation from "Black Lives Matter" calling for the firing of two officers involved in the fatal shooting of 25-year-old Ezell Ford, LAPD officials said. REUTERS/Mario Anzuoni (UNITED STATES - Tags: SOCIETY LAW) 

An activist stands during a news conference outside LAPD Headquarters in Los Angeles, California, January 9, 2015. Los Angeles police Chief Charlie Beck agreed to meet today with a delegation from "Black Lives Matter" calling for the firing of two officers involved in the fatal shooting of 25-year-old Ezell Ford, LAPD officials said. REUTERS/Mario Anzuoni (UNITED STATES - Tags: SOCIETY LAW) 

Activists stand during a news conference outside LAPD Headquarters in Los Angeles, California January 9, 2015. Los Angeles police Chief Charlie Beck agreed to meet today with a delegation from "Black Lives Matter" calling for the firing of two officers involved in the fatal shooting of 25-year-old Ezell Ford, LAPD officials said. REUTERS/Mario Anzuoni (UNITED STATES - Tags: SOCIETY LAW) 

Activists stand during a news conference outside LAPD Headquarters in Los Angeles, California January 9, 2015. Los Angeles police Chief Charlie Beck agreed to meet today with a delegation from "Black Lives Matter" calling for the firing of two officers involved in the fatal shooting of 25-year-old Ezell Ford, LAPD officials said. REUTERS/Mario Anzuoni (UNITED STATES - Tags: SOCIETY) 

An activist draws with chalk during a news conference outside LAPD Headquarters in Los Angeles, California, January 9, 2015. Los Angeles police Chief Charlie Beck agreed to meet today with a delegation from "Black Lives Matter" calling for the firing of two officers involved in the fatal shooting of 25-year-old Ezell Ford, LAPD officials said. REUTERS/Mario Anzuoni (UNITED STATES - Tags: SOCIETY LAW) 

Professor and activist Melina Abdullah speaks during a news conference outside LAPD Headquarters in Los Angeles, California, January 9, 2015. Los Angeles police Chief Charlie Beck agreed to meet today with a delegation from "Black Lives Matter" calling for the firing of two officers involved in the fatal shooting of 25-year-old Ezell Ford, LAPD officials said. REUTERS/Mario Anzuoni (UNITED STATES - Tags: SOCIETY LAW) 

Ballots are pictured at the International Association of Machinists and Aerospace Workers (IAM) District Lodge 751 headquarters in Seattle, Washington January 3, 2014. The union is voting today on whether to accept a new contract put forth by Boeing to keep production of the new 777X jetliner in the Seattle area. REUTERS/David Ryder (UNITED STATES - Tags: TRANSPORT BUSINESS EMPLOYMENT) 

Ballots are pictured at the International Association of Machinists and Aerospace Workers (IAM) District Lodge 751 headquarters in Seattle, Washington January 3, 2014. The union is voting today on whether to accept a new contract put forth by Boeing to keep production of the new 777X jetliner in the Seattle area. REUTERS/David Ryder (UNITED STATES - Tags: TRANSPORT BUSINESS EMPLOYMENT) 

A volunteer from the International Association of Machinists and Aerospace Workers (IAM) District Lodge 751 counts ballots at the union's headquarters in Seattle, Washington January 3, 2014. The union is voting today on whether to accept a new contract put forth by Boeing to keep production of the new 777X jetliner in the Seattle area. REUTERS/David Ryder (UNITED STATES - Tags: TRANSPORT BUSINESS EMPLOYMENT) 

The corporate headquarter buildings of Gannett Co and its flagship newspaper, USA Today, are seen in McLean, Virginia, July 23, 2013. A decline in newspaper advertising dragged down Gannett Co's second-quarter results, underscoring the company's need for new revenue streams. REUTERS/Larry Downing (UNITED STATES - Tags: MEDIA BUSINESS LOGO) 

The logos of Gannett Co and its flagship newspaper, USA Today, are seen outside their corporate headquarters in McLean, Virginia, July 23, 2013. A decline in newspaper advertising dragged down Gannett Co's second-quarter results, underscoring the company's need for new revenue streams. REUTERS/Larry Downing (UNITED STATES - Tags: MEDIA BUSINESS LOGO) 

The corporate flags for the Gannett Co and its flagship newspaper, USA Today, fly outside their corporate headquarters in McLean, Virginia, July 23, 2013. A decline in newspaper advertising dragged down Gannett Co's second-quarter results, underscoring the company's need for new revenue streams. REUTERS/Larry Downing (UNITED STATES - Tags: MEDIA BUSINESS LOGO) 

The Beef Products Inc (BPI) headquarters is pictured in Dakota Dunes, South Dakota November 19, 2012. A year ago, Beef Products Inc. had four state-of-the art plants, more than 1,300 employees and was expanding aggressively. The meat company was the leading maker of "lean finely textured beef," a low-fat product made from chunks of beef, including trimmings, and exposed to tiny bursts of ammonium hydroxide to kill E. coli and other dangerous contaminants. Few Americans realized the product was a mainstay of fast-food burgers, school lunch tacos and homemade meatloaf. Today, the South Dakota company's revenues have plummeted from more than $650 million to about $130 million a year, and three of its plants are shuttered. Company officials blame the abrupt falloff on a series of ABC News broadcasts that began last March - stories that repeatedly called its product "pink slime." Photo taken November 19, 2012. REUTERS/Lane Hickenbottom (UNITED STATES - Tags: BUSINESS FOOD SOCIETY MEDIA) 

Nick Roth (L), Jennifer Letch (C) and Craig Letch pose for a photograph at Beef Products Inc company headquarters in Dakota Dunes, South DakotaNovember 19, 2012. A year ago, Beef Products Inc. had four state-of-the art plants, more than 1,300 employees and was expanding aggressively. The meat company was the leading maker of "lean finely textured beef," a low-fat product made from chunks of beef, including trimmings, and exposed to tiny bursts of ammonium hydroxide to kill E. coli and other dangerous contaminants. Few Americans realized the product was a mainstay of fast-food burgers, school lunch tacos and homemade meatloaf. Today, the South Dakota company's revenues have plummeted from more than $650 million to about $130 million a year, and three of its plants are shuttered. Company officials blame the abrupt falloff on a series of ABC News broadcasts that began last March - stories that repeatedly called its product "pink slime." Photo taken November 19, 2012. REUTERS/Lane Hickenbottom (UNITED STATES - Tags: BUSINESS FOOD SOCIETY MEDIA) 

(Counterclockwise from bottom left) Eldon Roth, founder and CEO of Beef Products Inc (BPI) and his wife Regina pose for a photograph with their son, Nick Roth, son-in-law Craig Letch and daughter Jennifer Letch at their company headquarters in Dakota Dunes, South Dakota November 19, 2012. A year ago, Beef Products Inc. had four state-of-the art plants, more than 1,300 employees and was expanding aggressively. The meat company was the leading maker of "lean finely textured beef," a low-fat product made from chunks of beef, including trimmings, and exposed to tiny bursts of ammonium hydroxide to kill E. coli and other dangerous contaminants. Few Americans realized the product was a mainstay of fast-food burgers, school lunch tacos and homemade meatloaf. Today, the South Dakota company's revenues have plummeted from more than $650 million to about $130 million a year, and three of its plants are shuttered. Company officials blame the abrupt falloff on a series of ABC News broadcasts that began last March - stories that repeatedly called its product "pink slime." Photo taken November 19, 2012. REUTERS/Lane Hickenbottom (UNITED STATES - Tags: BUSINESS FOOD SOCIETY MEDIA) 

Jason Gaswint keeps an eye on equipment readings from the Beef Products Inc (BPI) headquarters operations center in Dakota Dunes, South Dakota November 19, 2012. A year ago, Beef Products Inc. had four state-of-the art plants, more than 1,300 employees and was expanding aggressively. The meat company was the leading maker of "lean finely textured beef," a low-fat product made from chunks of beef, including trimmings, and exposed to tiny bursts of ammonium hydroxide to kill E. coli and other dangerous contaminants. Few Americans realized the product was a mainstay of fast-food burgers, school lunch tacos and homemade meatloaf. Today, the South Dakota company's revenues have plummeted from more than $650 million to about $130 million a year, and three of its plants are shuttered. Company officials blame the abrupt falloff on a series of ABC News broadcasts that began last March - stories that repeatedly called its product "pink slime." Photo taken November 19, 2012. REUTERS/Lane Hickenbottom (UNITED STATES - Tags: BUSINESS FOOD SOCIETY MEDIA) 

Senator Kirsten Gillibrand speaks to the media at the "Iran180" press conference outside the UN Headquarters in New York September 24, 2012. Top New York officials and community leaders gathered today at the press conference, organized by Iran180, to denounce the Iranian government on the occasion of President Ahmadinejad's annual address to the United Nations. REUTERS/Andrew Kelly (UNITED STATES - Tags: POLITICS) 

Senator Kirsten Gillibrand speaks to the media at the "Iran180" press conference outside the UN Headquarters in New York September 24, 2012. Top New York officials and community leaders gathered today at the press conference, organized by Iran180, to denounce the Iranian government on the occasion of President Ahmadinejad's annual address to the United Nations. REUTERS/Andrew Kelly (UNITED STATES - Tags: POLITICS) 

New York Council Speaker Christine Quinn speaks at the "Iran180" press conference outside the UN Headquarters in New York September 24, 2012. Top New York officials and community leaders gathered today at the press conference, organized by Iran180, to denounce the Iranian government on the occasion of President Ahmadinejad's annual address to the United Nations. REUTERS/Andrew Kelly (UNITED STATES - Tags: POLITICS) 

New York Council Speaker Christine Quinn speaks at the "Iran180" press conference outside the UN Headquarters in New York September 24, 2012. Top New York officials and community leaders gathered today at the press conference, organized by Iran180, to denounce the Iranian government on the occasion of President Ahmadinejad's annual address to the United Nations. REUTERS/Andrew Kelly (UNITED STATES - Tags: POLITICS) 

Senator Kirsten Gillibrand speaks at the "Iran180" press conference outside the UN Headquarters in New York September 24, 2012. Top New York officials and community leaders gathered today at the press conference, organized by Iran180, to denounce the Iranian government on the occasion of President Ahmadinejad's annual address to the United Nations. REUTERS/Andrew Kelly (UNITED STATES - Tags: POLITICS) 

Senator Kirsten Gillibrand speaks at the "Iran180" press conference outside the UN Headquarters in New York September 24, 2012. Top New York officials and community leaders gathered today at the press conference, organized by Iran 180, to denounce the Iranian government on the occasion of President Ahmadinejad's annual address to the United Nations. REUTERS/Andrew Kelly (UNITED STATES - Tags: POLITICS) 

Attorney Joseph Popolizio (R), who is representing Maricopa County Sheriff Joe Arpaio (L), holds a document as he speaks during a news conference at Arpaio's headquarters in Phoenix, Arizona May 10, 2012. The Department of Justice announced earlier today their lawsuit against Sheriff Arpaio and his department, alleging racial profiling against Latinos in the Maricopa County community. REUTERS/Joshua Lott (UNITED STATES - Tags: CRIME LAW POLITICS SOCIETY IMMIGRATION) 

Maricopa County Sheriff Joe Arpaio (L) stands with his attorneys, Joseph Popolizio (C) and John Masterson, during a news conference at Arpaio's headquarters in Phoenix, Arizona May 10, 2012. The Department of Justice announced earlier today their lawsuit against Sheriff Arpaio and his department, alleging racial profiling against Latinos in the Maricopa County community. REUTERS/Joshua Lott (UNITED STATES - Tags: CRIME LAW POLITICS SOCIETY IMMIGRATION) 

Maricopa County Sheriff Joe Arpaio hands documents to a reporter as his attorneys, Joseph Popolizio (2nd R) and John Masterson (R), speak during a news conference at Arpaio's headquarters in Phoenix, Arizona May 10, 2012. The Department of Justice announced earlier today their lawsuit against Sheriff Arpaio and his department, alleging racial profiling against Latinos in the Maricopa County community. REUTERS/Joshua Lott (UNITED STATES - Tags: CRIME LAW POLITICS SOCIETY IMMIGRATION) 

Attorney John Masterson (front), who is representing Maricopa County Sheriff Joe Arpaio (back L), holds a copy of a lawsuit filed against Apraio as he speaks during a news conference as attorney Joseph Popolizio listens at Arpaio's headquarters in Phoenix, Arizona May 10, 2012. The Department of Justice announced earlier today their lawsuit against Sheriff Arpaio and his department, alleging racial profiling against Latinos in the Maricopa County community. REUTERS/Joshua Lott (UNITED STATES - Tags: CRIME LAW POLITICS SOCIETY IMMIGRATION) 

Attorney Joseph Popolizio (R), who is representing Maricopa County Sheriff Joe Arpaio (L), speaks during a news conference at Arpaio's headquarters in Phoenix, Arizona May 10, 2012. The Department of Justice announced earlier today their lawsuit against Sheriff Arpaio and his department, alleging racial profiling against Latinos in the Maricopa County community. REUTERS/Joshua Lott (UNITED STATES - Tags: CRIME LAW POLITICS SOCIETY IMMIGRATION) 

Attorney Joseph Popolizio (L) who is representing Maricopa County Sheriff Joe Arpaio (C) speaks during a news conference as attorney John Masterson listens at Arpaio's headquarters in Phoenix, Arizona May 10, 2012. The Department of Justice announced earlier today their lawsuit against Sheriff Arpaio and his department, alleging racial profiling against Latinos in the Maricopa County community. REUTERS/Joshua Lott (UNITED STATES - Tags: CRIME LAW POLITICS SOCIETY IMMIGRATION) 

Maricopa County Sheriff Joe Arpaio speaks during a news conference at his headquarters in Phoenix, Arizona May 10, 2012. The Department of Justice announced earlier today their lawsuit against Sheriff Arpaio and his department, alleging racial profiling against Latinos in the Maricopa County community. REUTERS/Joshua Lott (UNITED STATES - Tags: CRIME LAW POLITICS SOCIETY IMMIGRATION HEADSHOT) 

Maricopa County Sheriff Joe Arpaio gestures as he speaks during a news conference with his attorney Joseph Popolizio (back R) at his headquarters in Phoenix, Arizona May 10, 2012. The Department of Justice announced earlier today their lawsuit against Sheriff Arpaio and his department, alleging racial profiling against Latinos in the Maricopa County community. REUTERS/Joshua Lott (UNITED STATES - Tags: CRIME LAW POLITICS SOCIETY IMMIGRATION) 

Maricopa County Sheriff Joe Arpaio speaks during a news conference with his attorneys, Joseph Popolizio (C) center and John Masterson (R), at his headquarters in Phoenix, Arizona May 10, 2012. The Department of Justice announced earlier today their lawsuit against Sheriff Arpaio and his department, alleging racial profiling against Latinos in the Maricopa County community. REUTERS/Joshua Lott (UNITED STATES - Tags: CRIME LAW POLITICS SOCIETY IMMIGRATION) 

Maricopa County Sheriff Joe Arpaio (L) speaks during a news conference with his attorneys, Joseph Popolizio (C) and John Masterson, at his headquarters in Phoenix, Arizona May 10, 2012. The Department of Justice announced earlier today their lawsuit against Sheriff Arpaio and his department, alleging racial profiling against Latinos in the Maricopa County community. REUTERS/Joshua Lott (UNITED STATES - Tags: CRIME LAW POLITICS SOCIETY IMMIGRATION) 

Chesapeake Energy Corporation's 50 acre campus is seen in Oklahoma City, Oklahoma, on April 17, 2012. From a single 6,000-square-foot building in 1989, the multi-building complex today contains almost one million square feet of office space and includes employee perks like on-site Botox treatments at the headquarters. Chesapeake Energy Corp. CEO Aubrey McClendon is one of the most successful energy entrepreneurs of recent decades. But he hasn't always proved popular with shareholders of the company he co-founded, the second-largest natural gas producer in the United States. Now, a series of previously undisclosed loans to McClendon could once again put Chesapeake's CEO and shareholders at odds. Picture taken April 17, 2012. To match Special Report CHESAPEAKE-MCCLENDON/LOANS REUTERS/Steve Sisney (UNITED STATES - Tags: BUSINESS ENERGY) 

Chesapeake Energy Corporation's 50 acre campus is seen in Oklahoma City, Oklahoma, on April 17, 2012. From a single 6,000-square-foot building in 1989, the multi-building complex today contains almost one million square feet of office space and includes employee perks like on-site Botox treatments at the headquarters. Chesapeake Energy Corp. CEO Aubrey McClendon is one of the most successful energy entrepreneurs of recent decades. But he hasn't always proved popular with shareholders of the company he co-founded, the second-largest natural gas producer in the United States. Now, a series of previously undisclosed loans to McClendon could once again put Chesapeake's CEO and shareholders at odds. Picture taken April 17, 2012. To match Special Report CHESAPEAKE-MCCLENDON/LOANS REUTERS/Steve Sisney (UNITED STATES - Tags: BUSINESS ENERGY) 

Chesapeake Energy Corporation's 50 acre campus is seen in Oklahoma City, Oklahoma, April 17, 2012. From a single 6,000-square-foot building in 1989, the multi-building complex today contains almost one million square feet of office space and includes employee perks like on-site Botox treatments at the headquarters. Chesapeake Energy Corp. CEO Aubrey McClendon is one of the most successful energy entrepreneurs of recent decades. But he hasn't always proved popular with shareholders of the company he co-founded, the second-largest natural gas producer in the United States. Now, a series of previously undisclosed loans to McClendon could once again put Chesapeake's CEO and shareholders at odds. Picture taken April 17, 2012. To match Special Report CHESAPEAKE-MCCLENDON/LOANS REUTERS/Steve Sisney (UNITED STATES - Tags: BUSINESS ENERGY) 

Occupy Charlotte protesters taunt Charlotte Mecklenburg Police officers in front of the police headquarters in Charlotte, North Carolina January 30, 2012. Charlotte Mecklenburg Police announced a new ordinance today making it illegal for persons to set up temporary structures on public space. REUTERS/Chris Keane (UNITED STATES - Tags: BUSINESS POLITICS CIVIL UNREST) 

Occupy LA protesters stand outside the Los Angeles Police Department headquarters during a march through the downtown financial district, in solidarity with Occupy Oakland protesters, in Los Angeles, California November 2, 2011. The Occupy movement held what they call a general strike with unions today in Oakland, California to try to disrupt commerce, banks and other symbols of corporate America, and marched on the city's port, one of the nation's largest. REUTERS/David McNew (UNITED STATES - Tags: CIVIL UNREST POLITICS BUSINESS) 

The directory of a building at 1712 Pioneer Avenue in Cheyenne, Wyoming shows the headquarters of a a firm called "Corporations Today," an incorporation service run by Gerald Pitts, in this photo taken April, 2011. Cheyenne, Wyoming represents a potent rival to the secretive business havens of Cyprus and the Cayman Islands. Corporations Today and its sister company Wyoming Corporate Services will help clients create a company, and more: set up a bank account for it; add a lawyer as a corporate director to invoke attorney-client privilege; even appoint stand-in directors and officers as high as CEO. To match Special Report USA/SHELL-COMPANIES REUTERS/Kelly Carr (UNITED STATES - Tags: BUSINESS) 

Eric Lefkofsky (L) and Brad Keywell stand in the lobby at the headquarters of Groupon in Chicago, Illinois, December 9, 2010. A few years ago Lefkofsky and Keywell put some seed funding behind 30-year-old Groupon founder Andrew Mason's viral couponing concept. Today it's one of the world's hottest companies with annual revenues reportedly ranging from $500 million to $2 billion. REUTERS/Frank Polich (UNITED STATES) 

Eric Lefkofsky (R) and Brad Keywell (L) at the headquarters of Groupon in Chicago, Illinois December 9, 2010. A few years ago Lefkofsky and Keywell put some seed funding behind 30-year-old Groupon founder Andrew Mason's viral couponing concept. Today it's one of the world's hottest companies with annual revenues reportedly ranging from $500 million to $2 billion. REUTERS/Frank Polich (UNITED STATES) 

Eric Lefkofsky (L) and Brad Keywell stand outside their offices at the headquarters of Groupon in Chicago, Illinois December 9, 2010. A few years ago Lefkofsky and Keywell put some seed funding behind 30-year-old Groupon founder Andrew Mason's viral couponing concept. Today it's one of the world's hottest companies with annual revenues reportedly ranging from $500 million to $2 billion. REUTERS/Frank Polich (UNITED STATES) 

U.S. President Barack Obama pulls his coat closed as he boards Air Force One on a cold morning in Washington January 21, 2011. Obama is travelling to New York today to visit GE headquarters. REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS) 

Austrian Foreign Minister Michael Spindelegger (R) presents U.S. Secretary of State Hillary Clinton with a birthday gift before the start of a Security Council Meeting at the U.N. headquarters in New York October 26, 2010. It is Hillary Clinton's 63rd birthday today. REUTERS/Jessica Rinaldi (UNITED STATES - Tags: POLITICS) 

A volunteers at Democratic National Headquarters sits beside boxes from all 50 states containing signed pledges supporting President Obama's budget in Washington April 1, 2009. Some 642,000 signed pledges will delivered today to elected officials on Capitol Hill according to Organizing for America (OFA) who coordinated the event. REUTERS/Kevin Lamarque (UNITED STATES POLITICS ELECTIONS BUSINESS) 

Kraft Foods Inc CEO Irene Rosenfeld speaks at the company's headquarters during the launch of their new corporate logo, in Northfield, Illinois, February 10, 2009. Rosenfeld has new marching orders for the 100,000 people who work at Kraft "Make today delicious." That new corporate mantra and a set of seven values to go with it are the latest step in Rosenfeld's strategy to turn around the largest North American food maker. REUTERS/John Gress (UNITED STATES) 

Kraft Foods Inc CEO Irene Rosenfeld speaks as Human Resources Executive Vice President Karen May watches during the launch of their new corporate logo at the company's headquarters in Northfield, Illinois, February 10, 2009. Rosenfeld has new marching orders for the 100,000 people who work at Kraft "Make today delicious." That new corporate mantra and a set of seven values to go with it are the latest step in Rosenfeld's strategy to turn around the largest North American food maker. REUTERS/John Gress (UNITED STATES) 

A view of the Kraft Foods Inc headquarters in Northfield, Illinois February 10, 2009. CEO Irene Rosenfeld has new marching orders for the 100,000 people who work at Kraft "Make today delicious." That new corporate mantra and a set of seven values to go with it are the latest step in Rosenfeld's strategy to turn around the largest North American food maker. Picture taken February 10, 2009. REUTERS/John Gress (UNITED STATES)