President Barack Obama, followed by, from second from left, Gen. David Petraeus, Defense Secretary Robert Gates, Vice President Joe Biden, and Joint Chiefs Chairman Adm. Michael Mullen, walks to the Rose Garden of the White House in Washington, Wednesday, June 23, 2010, to announce that Petraeus would replace Gen. Stanley McChrystal. (AP Photo/Charles Dharapak)
** FILE ** Dan Choi (center) falls as he is arrested for handcuffing himself to the fence outside the White House in Washington during a protest against the military's "don't ask, don't tell" policy on Nov. 15, 2010. (AP Photo/Pablo Martinez Monsivais, File)
**FILE** In this photo from Feb. 1, President Obama makes a statement in the Grand Foyer of the White House. From left: Council of Economic Council Chair Christina Romer; Treasury Secretary Timothy Geithner; the president; Budget Director Peter Orszag and chief economic adviser Lawrence Summers. (Associated Press)
Rahm Emanuel, who spent two years as White House chief of staff, campaigns at the Berghoff Restaurant before a news conference Thursday. Polls show him leading the race to be mayor of Chicago.
President Barack Obama, left, shakes hands with Senate Republican Leader Mitch McConnell, R-Ky., right, after signing the $858 billion tax deal into law in a ceremony in the Eisenhower Executive Office Building on the White House complex, Friday, Dec. 17, 2010 in Washington. (AP Photo/Pablo Martinez Monsivais)
President Obama, left, shakes hands with Senate Republican Leader Mitch McConnell of Kentucky, right, after signing the $858 billion tax deal into law in a ceremony in the Eisenhower Executive Office Building on the White House complex, Friday, Dec. 17, 2010 in Washington. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama updates the status of the tax-cut deal struck with congressional Republicans, at the White House in Washington, Monday, Dec. 13, 2010. The legislation would avert a Jan. 1 increase in income taxes for nearly all Americans, including middle and high earners. (AP Photo/J. Scott Applewhite)
World War II-era Navajo Code Talkers listen to President Obama speak Thursday at the White House Tribal Nations Conference, which was attended by representatives of the nation's 565 recognized American Indian tribes.
** FILE ** President Obama (center), accompanied by (from left) Defense Secretary Robert M. Gates, Vice President Joseph R. Biden Jr., Secretary of State Hillary Rodham Clinton and Marine Gen. James Cartwright, speaks about the Afghanistan-Pakistan annual review on Thursday, Dec. 16, 2010, at the White House in Washington. (AP Photo/Susan Walsh)
** FILE ** President Obama, accompanied by Vice President Joseph R. Biden (left) and Secretary of State Hillary Rodham Clinton, delivers a statement on Dec. 16, 2010, at the White House. (Associated Press)
AFL-CIO President Richard Trumka, who was at the White House for a meeting with President Obama in October, said the South Korea free-trade deal reached last week does not go far enough to protect American jobs. (Associated Press)