U.S. President George W. Bush and first lady Laura Bush, Vice President Cheney and his wife are joined by senior White House staff members on the South Lawn of the White House for a moment of silence to honor the 7-year anniversary of the attacks on the United States on September 11, in Washington September 11, 2008. REUTERS/Larry Downing (UNITED STATES) 

U.S. President George W. Bush and first lady Laura Bush, Vice President Dick Cheney and his wife are joined by senior White House staff members on the South Lawn of the White House for a moment of silence to honor the 7-year anniversary of the attacks on the United States on September 11, in Washington September 11, 2008. REUTERS/Larry Downing (UNITED STATES) 

Former U.S. first lady Barbara Bush (C) receives a Hawaiian lei from an unidentified supporter beside former President George H. W. Bush (L) during the second session at the 2008 Republican National Convention in St. Paul, Minnesota September 2, 2008. REUTERS/Rick Wilking (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA) 

Former U.S. first lady Barbara Bush (C) receives a Hawaiian lei from an unidentified supporter beside former President George H. W. Bush (L) during the second session at the 2008 Republican National Convention in St. Paul, Minnesota September 2, 2008. REUTERS/Rick Wilking (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA) 

Former U.S. First Lady Barbara Bush (C) receives a Hawaiian lei from an unidentified supporter beside former President George H. W. Bush (L) during the second session at the 2008 Republican National Convention in St. Paul, Minnesota in this September 2, 2008 combination photograph. REUTERS/Rick Wilking (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA) 

U.S. President George W. Bush (R) shakes hands with Denmark's Crown Princess Mary (standing L) and Crown Prince Frederik (standing 2nd L) during the Group B men's basketball game between China and the U.S. at the Beijing 2008 Olympic Games August 10, 2008. Also present were Bush's father and former president George H.W. Bush (seated 2nd L), his sister Dorothy Bush (seated L) and China's Foreign Minister Yang Jiechi. REUTERS/Eric Gaillard (CHINA) 

U.S. President George W. Bush (L) and his father former President George H. W. Bush (2nd R) pose for a photo with the Beijing 2008 Olympic men's 400m individual medley gold medalist Michael Phelps (R), and men's 400m freestyle bronze medalist Larsen Jensen (2nd L) at the National Aquatics Center in Beijing August 10, 2008. REUTERS/Larry Downing (CHINA) 

U.S. President George W. Bush (L) and former U.S. President George Bush (R) hold up U.S. flags during the swimming competition in the National Aquatics Center at the Beijing 2008 Olympic Games August 10, 2008. REUTERS/Jerry Lampen (CHINA) 

U.S. President George W. Bush talks to the press next to Senior Pastor Li Jian-An (L) and the children choir after attending a church service at the Beijing Kuanjie Protestant Christian Church in Beijing, China, August 10, 2008. REUTERS/Larry Downing (CHINA) 

U.S. President George W. Bush (L) speaks to his father, former U.S. President George H.W. Bush, during the dedication of the new U.S. embassy in Beijing August 8, 2008. REUTERS/Larry Downing (CHINA) 

Republican presidential candidate U.S. Senator John McCain (R-AZ) (L) arrives for a news conference with former U.S. President George Bush on a golf cart at former President Bush's residence on Walker's Point in Kennebunkport, Maine July 21, 2008. REUTERS/Brian Snyder (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA) 

Reporters' audio recorders lie at the feet of Republican presidential candidate US Senator John McCain (R-AZ) (R) and former U.S. President George Bush as they answer questions at former President Bush's residence on Walker's Point in Kennebunkport, Maine July 21, 2008. REUTERS/Brian Snyder (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA) 

An activist dressed up U.S. President George W. Bush holds balloons symbolizing their countries' carbon emissions at an anti-G8 event in Sapporo, July 8, 2008, during the G8 Hokkaido Toyako Summit. The Group of Eight leaders are set on Tuesday to take an "important step" forward on fighting global warming, the stickiest issue at their summit, a European Union source said. Senior G8 officials met late into the night in Japan to thrash out wording that would allow Bush to put aside deep misgivings and sign on to a long-term global goal, the EU source said, asking not to be named. REUTERS/Kim Kyung-Hoon (JAPAN) 

U.S. Vice President Dick Cheney (C) and senior Administration officials watch as U.S. President George W. Bush hosts a meeting with Israel Prime Minister Ehud Olmert in the Oval Office of the White House in Washington June 4, 2008. From L-R are: Assistant Secretary of State C. David Wells, National Security Adviser Stephen Hadley, Cheney, an unidentified Israeli official and U.S. Secretary of State Condoleezza Rice. REUTERS/Larry Downing (UNITED STATES) 

U.S. President George W. Bush bows his head in prayer with the President of Furman University David Shi (L) and graduating senior and commencement speaker Meredith Neville (R) as he attends the commencement ceremony in Paladin Stadium at Furman University in Greenville, South Carolina May 31, 2008. REUTERS/Larry Downing (UNITED STATES) 

U.S. President George W. Bush bows his head in prayer with the President of Furman University David Shi (L) and graduating senior and commencement speaker Meredith Neville (R) as he attends the commencement ceremony in Paladin Stadium at Furman University in Greenville, South Carolina May 31, 2008. REUTERS/Larry Downing (UNITED STATES) 

U.S. President George W. Bush holds Barbara Walsh as she accepts a medal for her deceased son, Sergeant First Class Benjamin Sebban, during a division review ceremony at Fort Bragg, home of the 82nd Airborne, in North Carolina May 22, 2008. Sebban was posthumously awarded the Silver Star for gallantry in action as a Senior Medic in support of Operation Iraqi Freedom. REUTERS/Kevin Lamarque (UNITED STATES) 

U.S. President George W. Bush holds Barbara Walsh as she accepts a medal for her deceased son, Sergeant First Class Benjamin Sebban, during a division review ceremony at Fort Bragg, home of the 82nd Airborne, in North Carolina May 22, 2008. Sebban was posthumously awarded the Silver Star for gallantry in action as a Senior Medic in support of Operation Iraqi Freedom. REUTERS/Kevin Lamarque (UNITED STATES) 

Former U.S. President George H. W. Bush (C) walks with granddaughter Barbara Bush (L), and daughter-in-law Margaret Bush (R), towards Air Force One before departing Texas for Washington May 11, 2008. REUTERS/Larry Downing (UNITED STATES) 

U.S. Secretary of State Condoleezza Rice meets with Palestinian President Mahmoud Abbas (R) in Washington April 23, 2008. Abbas will call for urgent international action to jump start Middle East peace talks when he meets President George W. Bush this week, a senior Palestinian official said on Wednesday. REUTERS/Kevin Lamarque (UNITED STATES) 

U.S. Secretary of State Condoleezza Rice meets with Palestinian President Mahmoud Abbas (R) in Washington April 23, 2008. Abbas will call for urgent international action to jump start Middle East peace talks when he meets President George W. Bush this week, a senior Palestinian official said on Wednesday. REUTERS/Kevin Lamarque (UNITED STATES) 

U.S. President George W. Bush meets with the Senior Minister of Singapore Goh Chok Tong in the Oval office in Washington April 9, 2008. REUTERS/Kevin Lamarque (REUTERS) 

U.S. President George W. Bush meets with the Senior Minister of Singapore Goh Chok Tong in the Oval office in Washington April 9, 2008. REUTERS/Kevin Lamarque (REUTERS) 

U.S. President George W. Bush meets with the Senior Minister of Singapore Goh Chok Tong in the Oval office in Washington April 9, 2008. REUTERS/Kevin Lamarque (REUTERS) 

Former U.S. President George Bush poses with Texas cheerleaders during the NCAA men's South Regional finals basketball game between Memphis and Texas in Houston, Texas March 30, 2008. REUTERS/Jessica Rinaldi (UNITED STATES) 

Peter Peterson, Senior Chairman of the Blackstone Group, talks before U.S. President George W. Bush's speech at the Economic Club of New York, March 14, 2008. REUTERS/Larry Downing (UNITED STATES) 

U.S. President George W. Bush (C) and former Secretary of State Henry Kissinger (R) smile as Senior Chairman of the Blackstone Group Peter Peterson looks on at the Economic Club of New York March 14, 2008. REUTERS/Larry Downing (UNITED STATES) 

U.S. President George W. Bush (C) speaks about Free Trade Agreements with Korea and Colombia while talking to former Cabinet Secretaries and senior government officials in the Eisenhower Executive Building on the White House Complex in Washington, February 26, 2008. REUTERS/Larry Downing (UNITED STATES) 

U.S. President George W. Bush (3rd R) signs the 2008 Economic Report in the Oval Office of the White House in Washington, February 11, 2008. Watching on are (L-R) Deputy Assistant to the President for Economic Policy Chuck Blahous, Council of Economic Advisers Chief of Staff Pierce Scranton, Council of Economic Advisors Chairman Eddie Lazear, Council of Economic Advisers Senior Economic Adviser Donald Marron and Assistant to the President for Economic Policy Keith Hennessey. REUTERS/Jason Reed (UNITED STATES) 

U.S. President George W. Bush (3rd R) speaks to the press after signing the 2008 Economic Report in the Oval Office of the White House in Washington, February 11, 2008. Watching on are (L-R) Deputy Assistant to the President for Economic Policy Chuck Blahous, Council of Economic Advisers Chief of Staff Pierce Scranton, Council of Economic Advisors Chairman Eddie Lazear, Council of Economic Advisers Senior Economic Adviser Donald Marron and Assistant to the President for Economic Policy Keith Hennessey. REUTERS/Jason Reed (UNITED STATES) 

Ismail Haniyeh (R), the Hamas leader dismissed as prime minister by President Mahmoud Abbas listens to senior Hamas leader Mahmoud al-Zahar who's son was killed by Israeli troops during a raid in Gaza, January 15, 2008. Israel killed 16 Palestinians, nearly all of them Hamas militants, in the Gaza Strip on Tuesday, in a raid the Palestinian Authority said was a "slap in the face" to U.S. President George W. Bush's peace efforts. REUTERS/Suhaib Salem (GAZA) 

Senior Hamas leader Mahmoud al-Zahar (C) mourns beside the body of his son Hosam, who was killed by Israeli troops during a raid in Gaza January 15, 2008. Israel killed 16 Palestinians, nearly all of them Hamas militants, in the Gaza Strip on Tuesday, in a raid the Palestinian Authority said was a "slap in the face" to U.S. President George W. Bush's peace efforts. REUTERS/Suhaib Salem (GAZA) 

Senior Hamas leader Mahmoud al-Zahar (L) touches the head of his son, who was killed by Israeli troops during a raid, in Gaza January 15, 2008. Israel killed 16 Palestinians, nearly all of them Hamas militants, in the Gaza Strip on Tuesday, in a raid the Palestinian Authority said was a "slap in the face" to U.S. President George W. Bush's peace efforts. REUTERS/Suhaib Salem (GAZA) 

Senior Hamas leader Mahmoud al-Zahar displays blood from his son, who was killed by Israeli troops during a raid, in Gaza January 15, 2008. Israel killed 16 Palestinians, nearly all of them Hamas militants, in the Gaza Strip on Tuesday, in a raid the Palestinian Authority said was a "slap in the face" to U.S. President George W. Bush's peace efforts. REUTERS/Suhaib Salem (GAZA) 

U.S. President George W. Bush sits at a table with officials as he hosts a meeting during the Middle East peace conference at the U.S. Naval Academy in Annapolis, November 27, 2007. At the table are (clockwise from extreme L) Israel's Foreign Minister Tzipi Livni, Israel's Prime Minister Ehud Olmert, Senior Palestinian negotiator Saeb Erekat, Chief Palestinian Negotiator Ahmed Qurie, Palestinian President Mahmoud Abbas, U.S. National Security Advisor Stephen Hadley, U.S. Secretary of State Condoleezza Rice, Bush, and former Israeli prime minister Ehud Barak. REUTERS/Loay Abu Haykel (UNITED STATES) 

U.S. President George W. Bush sits at a table with officials as he hosts a meeting during the Middle East peace conference at the U.S. Naval Academy in Annapolis, November 27, 2007. At the table are (clockwise from bottom L) U.S. National Security Advisor Stephen Hadley, U.S. Secretary of State Condoleezza Rice, Bush, former Israeli prime minister Ehud Barak, Israel's Foreign Minister Tzipi Livni, Israel's Prime Minister Ehud Olmert, Senior Palestinian negotiator Saeb Erekat, Chief Palestinian Negotiator Ahmed Qurie and Palestinian President Mahmoud Abbas. REUTERS/Loay Abu Haykel (UNITED STATES) 

Senior Hamas and Islamic Jihad leaders Mahmoud al-Zahar (L) and Mohammed al-Hendi attend a Hamas-led factional conference in Gaza November 26, 2007. President George W. Bush meets Palestinian and Israeli leaders on Monday in a drive for Palestinian statehood before he leaves office in 14 months. Palestinian President Mahmoud Abbas in June lost control of the Gaza Strip to Hamas Islamists, who are not invited to the Annapolis talks and on Monday were holding an "alternative conference" to promote their opposition to peaceful coexistence with the Jewish state. REUTERS/Suhaib Salem (GAZA) 

Senior Hamas and Islamic Jihad leaders Mahmoud al-Zahar (L) and Mohammed al-Hendi (C) attend a Hamas-led factional conference in Gaza November 26, 2007. President George W. Bush meets Palestinian and Israeli leaders on Monday in a drive for Palestinian statehood before he leaves office in 14 months. Palestinian President Mahmoud Abbas in June lost control of the Gaza Strip to Hamas Islamists, who are not invited to Annapolis and on Monday were holding an "alternative conference" to promote their opposition to peaceful coexistence with the Jewish state. REUTERS/Suhaib Salem (GAZA) 

U2 lead singer Bono (L) and former U.S. President George H.W. Bush arrive for the National Constitution Center's 2007 Liberty Medal ceremony in Philadelphia September 27, 2007. REUTERS/Jim Young (UNITED STATES) 

A view of Lafayette Park near the White House is seen in Washington early September 10, 2007. U.S. General David Petraeus, the top commander in the war in Iraq whose testimony is considered crucial to U.S. strategy in the highly unpopular war in Iraq, is expected to tell Congress on Monday that U.S. troop levels should not be cut deeply. The report could be a turning point in the conflict and is considered vital to any decisions by President George W. Bush on force levels as he faces demands from Democrats and some senior Republicans for U.S. troops to start leaving Iraq. REUTERS/Jonathan Ernst (UNITED STATES) 

The White House is seen in Washington early September 10, 2007. U.S. General David Petraeus, the top commander in the war in Iraq whose testimony is considered crucial to U.S. strategy in the highly unpopular war in Iraq, is expected to tell Congress on Monday that U.S. troop levels should not be cut deeply. The report could be a turning point in the conflict and is considered vital to any decisions by President George W. Bush on force levels as he faces demands from Democrats and some senior Republicans for U.S. troops to start leaving Iraq. REUTERS/Jonathan Ernst (UNITED STATES) 

Senior advisor to the President, Karl Rove (R) walks with the U.S. President George W. Bush towards Air Force One at Andrews Air Force Base outside Washington before departing for Texas, August 13, 2007. REUTERS/Larry Downing (UNITED STATES) 

Senior advisor to the President, Karl Rove walks with his luggage after arriving in Waco with U.S. President George W. Bush (not pictured), August 13, 2007. REUTERS/Larry Downing (UNITED STATES) 

Senior advisor to the President, Karl Rove (C) walks off the Air Force One after arriving in Waco with the U.S. President George W. Bush (not pictured), August 13, 2007. REUTERS/Larry Downing (UNITED STATES) 

U.S. President George W. Bush and his senior advisor Karl Rove (R) walk towards Air Force One at Andrews Air Force Base outside Washington before departing for Texas August 13, 2007. Rove, who set the political strategy for U.S. President George W. Bush's two White House victories and became a favorite target for critics, said on Monday he was resigning and returning home to Texas. REUTERS/Larry Downing (UNITED STATES) 

U.S. President George W. Bush and his senior advisor Karl Rove (R) walk towards Air Force One at Andrews Air Force Base outside Washington before departing for Texas August 13, 2007. Rove, who set the political strategy for U.S. President George W. Bush's two White House victories and became a favorite target for critics, said on Monday he was resigning and returning home to Texas. REUTERS/Larry Downing (UNITED STATES) 

U.S. President George W. Bush and his senior advisor Karl Rove (R) walk towards Air Force One at Andrews Air Force Base outside Washington before departing for Texas August 13, 2007. Rove, who set the political strategy for U.S. President George W. Bush's two White House victories and became a favorite target for critics, said on Monday he was resigning and returning home to Texas. REUTERS/Larry Downing (UNITED STATES) 

Karl Rove (R), senior advisor to the President, walks with U.S. President George W. Bush towards Air Force One at Andrews Air Force Base outside Washington before departing for Texas, August 13, 2007. Rove said on Monday he was resigning. REUTERS/Larry Downing (UNITED STATES) 

Karl Rove (R), senior advisor to the President, walks with U.S. President George W. Bush towards Air Force One at Andrews Air Force Base outside Washington before departing for Texas, August 13, 2007. Rove said on Monday he was resigning. REUTERS/Larry Downing (UNITED STATES) 

U.S. President George W. Bush (L) nearly loses his cap while fishing with his father former U.S. President George H.W. Bush in the waters off Kennebunkport, Maine August 12, 2007. REUTERS/Brian Snyder (UNITED STATES) 

French President Nicolas Sarkozy (2nd L) waves as he is escorted by U.S. President George W. Bush (L), as former President George H.W. Bush and former first lady Barbara Bush (R) look on, at the Bush family residence in Kennebunkport, Maine, August 11, 2007. REUTERS/Jason Reed (UNITED STATES) 

Deputy Chief of Staff and Senior Advisor to the President Karl Rove is illuminated by reflected blue light while U.S. President George W. Bush speaks to the American Legislative Exchange Council at the Marriott Downtown in Philadelphia, July 26, 2007. REUTERS/Larry Downing (UNITED STATES) 

Deputy Chief of Staff and Senior Advisor to the President Karl Rove sits in a pool of reflected blue light while U.S. President George W. Bush speaks to the American Legislative Exchange Council at the Marriott Downtown in Philadelphia, July 26, 2007. REUTERS/Larry Downing (UNITED STATES) 

Tiger Woods (R) drives former U.S. President George H. W. Bush past an honor guard to the first tee as part of a ceremonial drive during the Earl Woods Memorial Pro-Am before the start of the AT&T National PGA golf tournament at Congressional Country Club in Bethesda, Maryland July 4, 2007. REUTERS/Jonathan Ernst (UNITED STATES) 

Tiger Woods (2nd R) and former U.S. President George H.W. Bush (R) are driven off the 18th green during the Earl Woods Memorial Pro-Am before the start of the AT&T National PGA golf tournament at Congressional Country Club in Bethesda, Maryland July 4, 2007. REUTERS/Jonathan Ernst (UNITED STATES) 

U.S. President George W. Bush (front L) and Russia's President Vladimir Putin (C) ride in former U.S. President George H.W. Bush's (front R) boat in the waters off Kennebunkport, Maine July 1, 2007 REUTERS/Brian Snyder (UNITED STATES) 

U.S. President George W. Bush (L) casts a line as his father, former U.S. President George Bush, watches on as they go fishing off the coast of Kennebunkport, Maine, June 29, 2007. REUTERS/Jason Reed (UNITED STATES)