Former U.S. Secretary of State Hillary Clinton (L) speaks about a commitment to stop poaching of African elephants, as daughter Chelsea looks on, at the Clinton Global Initiative (CGI) in New York September 26, 2013. The CGI was created by Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS) 

Former U.S. Secretary of State Hillary Clinton (R) speaks with daughter Chelsea (2nd R) in front of African heads of state and members of wildlife organizations about a commitment to stop poaching of African elephants at the Clinton Global Initiative (CGI) in New York September 26, 2013. The CGI was created by Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS) 

Former U.S. President Bill Clinton gestures towards his wife, former U.S. Secretary of State Hillary Clinton during the closing plenary session of the Clinton Global Initiative (CGI) in New York September 26, 2013. The CGI was created by Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS) 

Former U.S. Secretary of State Hillary Clinton (R), laughs after a joke about her work saving elephants with Chelsea Clinton (C), and Marc Mezvinsky applaud while listening to former U.S. President Bill Clinton during the closing plenary session of the Clinton Global Initiative (CGI) in New York September 26, 2013. The CGI was created by Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS) 

Chelsea Clinton (2nd L) laughs with her husband Marc Mezvinsky (L) and parents former U.S. Secretary of State Hillary Clinton (2nd R) and former U.S. President Bill Clinton, during the closing plenary session of the Clinton Global Initiative (CGI) in New York September 26, 2013. The CGI was created by Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS) 

Former U.S. President Bill Clinton greets his daughter Chelsea Clinton as he takes the stage during the closing plenary session of the Clinton Global Initiative (CGI) in New York September 26, 2013. The CGI was created by Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS) 

Former U.S. President Bill Clinton addresses attendees at the closing plenary session for Clinton Global Initiative (CGI) in New York September 26, 2013. The CGI was created by Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Adrees Latif (UNITED STATES - Tags: POLITICS)

Dame Jane Goodall attends a panel on "Commitment to Action: Partnership to Save Africa's Elephants" at the Clinton Global Initiative (CGI) in New York September 26, 2013. The CGI was created by former U.S. President Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: ENVIRONMENT POLITICS)

Hikmet Ersek, president and CEO of the Western Union Company, speaks on a panel at the Clinton Global Initiative (CGI) in New York September 26, 2013. The CGI was created by Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS BUSINESS) 

Former U.S. President Bill Clinton does an impression of artist Bono during the Clinton Global Initiative (CGI) in New York September 25, 2013. The CGI was created by Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS) 

Former U.S. Secretary of State Hillary Clinton (L) talks to actor Ben Affleck on stage during the awards ceremony at the Clinton Global Initiative 2013 (CGI) in New York, September 25, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: POLITICS ENTERTAINMENT) 

Former U.S. Secretary of State Hillary Clinton (L) hugs Rania Al Abdullah the Queen of Jordan during the awards ceremony at the Clinton Global Initiative 2013 (CGI) in New York, September 25, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: POLITICS ROYALS) 

Malala Yousafzai (R) waves as she receives the "Leadership in Civil Society" award from Rania Al Abdullah, the Queen of Jordan at the Clinton Global Initiative 2013 (CGI) in New York, September 25, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: POLITICS ROYALS) 

Malala Yousafzai speaks after she received the "Leadership in Civil Society" award at the Clinton Global Initiative 2013 (CGI) in New York, September 25, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: POLITICS) 

Mayor of New York Michael Bloomberg (L) receives his "Global Citizen" award from Vice President of U.S. Joe Biden during the awards ceremony at the Clinton Global Initiative 2013 (CGI) in New York, September 25, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: POLITICS) 

Former U.S. Secretary of State and former first lady Hillary Clinton speaks during a Clinton Global Initiative (CGI) conference in New York September 25, 2013. The CGI was created by former U.S. President Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS) 

Former U.S. President Bill Clinton speaks during a session called "Expanding Cross-Sector Coordination in Haiti" at the Clinton Global Initiative 2013 (CGI) in New York September 25, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: POLITICS)

Former U.S. President Bill Clinton speaks during an interview at the Clinton Global Initiative (CGI) in New York September 25, 2013. The CGI was created by Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS) 

Former U.S. President Bill Clinton (R) laughs with Piers Morgan during an interview at the Clinton Global Initiative (CGI) in New York September 25, 2013. The CGI was created by Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS) 

CNN personality Piers Morgan (L) laughs with actress America Ferrera (2nd L), Chelsea Clinton (C), and Peggy Mativo, founder and executive director or PACEmaker International, laugh while on a panel at the Clinton Global Initiative (CGI) in New York September 25, 2013. The CGI was created by Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS ENTERTAINMENT) 

Actress America Ferrera speaks on a panel at the Clinton Global Initiative (CGI) in New York September 25, 2013. The CGI was created by Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS ENTERTAINMENT) 

Muhtar Kent, chairman and CEO of the Coca-Cola Company, laughs with Chelsea Clinton while speaking on a panel at the Clinton Global Initiative (CGI) in New York September 25, 2013. The CGI was created by Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS) 

Lloyd Blankfein (L), chairman and CEO of the Goldman Sachs Group, Inc., Jim Rogers, chairman of the board of Duke Energy Corporation, and Denis O'Brien (R), chairman of Digicel, take part in a panel at the Clinton Global Initiative (CGI) in New York September 25, 2013. The CGI was created by Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS) 

Actor Sean Penn, Ambassador-at-Large, Republic of Haiti and Founder of the J/P Haitian Relief Organization, smokes an electronic cigarette during a breakout session labeled "Expanding Cross-Sector Coordination in Haiti" at the Clinton Global Initiative 2013 (CGI) in New York September 25, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: POLITICS ENTERTAINMENT)

Actor Sean Penn, Ambassador-at-Large, Republic of Haiti and Founder of the J/P Haitian Relief Organization, attends a breakout session labeled "Expanding Cross-Sector Coordination in Haiti" at the Clinton Global Initiative 2013 (CGI) in New York September 25, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: POLITICS ENTERTAINMENT)

Kay Krill, President and CEO of Ann Inc., takes part in a session labeled "Lessons from the Front Lines of Women's Leadership" at the Clinton Global Initiative 2013 (CGI) in New York September 25, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: POLITICS BUSINESS)

Actress Kate Hudson takes part in the "Lessons from the Front Lines of Women's Leadership" session at the Clinton Global Initiative 2013 (CGI) in New York September 25, 2013. REUTERS/Adrees Latif (UNITED STATES - Tags: POLITICS ENTERTAINMENT)

John Chambers, chairman and CEO of Cisco speaks in front of Chelsea Clinton at the Clinton Global Initiative (CGI) in New York September 25, 2013. The CGI was created by Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS) 

Chelsea Clinton thanks Laiba Shahzadi (R) and Yaweta Chavula during the closing plenary session of the Clinton Global Initiative (CGI) in New York September 26, 2013. The CGI was created by former U.S. President Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS SOCIETY) 

Pat Mitchell (L), President and CEO of The Paley Center, and Lubna Al Qasimi, Minister, International Cooperation and Development in the United Arab Emirates, take part in a plenary session labeled "Women Decision-Makers in the Global Economy," at the Clinton Global Initiative 2013 (CGI) in New York September 25, 2013. REUTERS/Adrees Latif (UNITED STATES - Tags: POLITICS)

Pat Mitchell (L), President and CEO of The Paley Center, leads a plenary session labeled "Women Decision-Makers in the Global Economy," at the Clinton Global Initiative 2013 (CGI) in New York September 25, 2013. Taking part in the panel from left to right are Mitchell; Minister of International Cooperation and Development in the United Arab Emirates Lubna Al Qasimi; Qualcomm Founding Chairman and CEO Emeritus Irwin Jacobs; Founder and Chair at Sisters Capital Halla Tomasdottir and President and CEO Marriott International, Inc. Arne M. Sorenson. REUTERS/Adrees Latif (UNITED STATES - Tags: POLITICS BUSINESS)

Former U.S. President Bill Clinton (L) and U.S. President Barack Obama discuss healthcare reform at the Clinton Global Initiative in New York September 24, 2013.

REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS HEALTH) 

U.S. President Barack Obama (R) and former U.S. President Bill Clinton discuss health care during the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Adrees Latif (UNITED STATES - Tags: POLITICS HEALTH)

Former U.S. President Bill Clinton shakes hands with U.S. President Barack Obama after a discussion about healthcare at the Clinton Global Initiative (CGI) in New York September 24, 2013. The CGI was created by Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS HEALTH) 

U.S. President Barack Obama waves as he departs after a discussion about healthcare at the Clinton Global Initiative (CGI) in New York September 24, 2013. The CGI was created by former U.S. President Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS HEALTH) 

U.S. President Barack Obama discusses healthcare reform at the Clinton Global Initiative in New York September 24, 2013. REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS HEALTH) 

Former U.S. President Bill Clinton walks on stage at the start of the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS)

Former U.S. President Bill Clinton speaks on stage during the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: POLITICS)

Former U.S. President Bill Clinton speaks during the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Adrees Latif (UNITED STATES - Tags: POLITICS)

The daughter of former U.S. President Bill Clinton, Chelsea Clinton, speaks on stage at the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS)

Former U.S. Secretary of State and former first lady Hillary Clinton (C) and daughter Chelsea Clinton chat with former U.S. President Bill Clinton at the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS)

Former U.S. Secretary of State and former first lady Hillary Clinton (L) and daughter Chelsea Clinton smile while former U.S. President Bill Clinton speaks at the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS)

Chelsea Clinton, daughter of former U.S. President Bill Clinton, speaks to Rosita the muppet during the Clinton Global Initiative (CGI) in New York September 24, 2013. The CGI was created by Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS HEALTH ENTERTAINMENT) 

Chelsea Clinton, daughter of former U.S. President Bill Clinton, interacts with Rosita the muppet during the Clinton Global Initiative (CGI) in New York September 24, 2013. The CGI was created by Bill Clinton in 2005 to gather global leaders to discuss solutions to the world's problems. REUTERS/Lucas Jackson (UNITED STATES - Tags: ENTERTAINMENT POLITICS HEALTH) 

Former U.S. Secretary of State and former U.S. first lady Hillary Clinton (L) and daughter Chelsea Clinton watch the discussions on stage at the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Adrees Latif (UNITED STATES - Tags: POLITICS)

Former U.S. Secretary of State and former U.S. first lady Hillary Clinton laughs while meeting guests as she arrives at the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS TPX IMAGES OF THE DAY)

Managing Director of the International Monetary Fund, Christine Lagarde, laughs as the lead singer of U2, Bono, does an impression of former U.S. President Bill Clinton before Clinton took the stage at the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Adrees Latif (UNITED STATES - Tags: POLITICS ENTERTAINMENT)

Former U.S. President Bill Clinton (L) laughs as U2 lead singer Bono (C) walks on stage after having imitated him during the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: POLITICS ENTERTAINMENT)

Bono, lead singer of Irish rock band U2, listens as the chief operating officer of Facebook, Sheryl Sandberg, speaks at the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Adrees Latif (UNITED STATES - Tags: POLITICS BUSINESS ENTERTAINMENT)

The lead singer of Irish rock band U2, Bono, listens as the founder of Giving Women Wings in Pakistan, Khalida Brohi, speaks at at the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Adrees Latif (UNITED STATES - Tags: ENTERTAINMENT POLITICS SOCIETY)

From left, Founder of Microsoft, Bill Gates; UNICEF's Deputy Executive Director, Geeta Rao Gupta; and Tony Elumelu, Chairman of Heirs Holdings Limited, attend the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS BUSINESS SOCIETY)

The founder of Microsoft, Bill Gates, speaks on stage at the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Lucas Jackson (UNITED STATES - Tags: BUSINESS POLITICS)

Chief Inspiration Officer and Starkey Hearing Foundation Fellow and Partners in Excellence Inc's Zhao Chun Li "Angel" (L) looks at Chairman and CEO of the Special Olympics Timothy Shriver as he speaks at the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. Shriver is holding the rope that served as a leash - for 7 years - keeping a young boy with intellectual disabilities tied to a tree. REUTERS/Lucas Jackson (UNITED STATES - Tags: POLITICS OLYMPICS SOCIETY)

Chairman and Chief Executive Officer of The Coca-Cola Company, Muhtar Kent, talks during a press conference at the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Lucas Jackson (UNITED STATES - Tags: BUSINESS POLITICS)

Former U.S. Secretary of State and former U.S. first lady Hillary Clinton (C) watches during the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: POLITICS)

Managing Director of the International Monetary Fund, Christine Lagarde, listens during the Clinton Global Initiative 2013 (CGI) in New York, September 24, 2013. REUTERS/Lucas Jackson (UNITED STATES - Tags: BUSINESS HEADSHOT POLITICS)

The daughter of former U.S. President Bill Clinton, Chelsea Clinton, sits and listens during the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: POLITICS)

From Left; Former U.S. President Bill Clinton; Managing Director of the International Monetary Fund, Christine Lagarde; Founder of the Mo Ibrahim Foundation, Mo Ibrahim; CEO of Facebook, Sheryl Sandberg' lead Singer of U2, Bono; the Founder of Giving Women Wings in Pakistan, Khalida Brohi, attend the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Adrees Latif (UNITED STATES - Tags: POLITICS ENTERTAINMENT BUSINESS)

Former U.S. President Bill Clinton is seen on a large monitor on the stage as he speaks during the Clinton Global Initiative 2013 (CGI) in New York September 24, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: POLITICS)