George W. Bush, Barack Obama, Bill Clinton, Jimmy Carter, George H.W. Bush

A photo from the exhibit. From left, George W. Bush, Barack Obama, Bill Clinton, Jimmy Carter, and George H.W. Bush.

President George W. Bush hosts President-elect Barack Obama, and former presidents, from left, George H.W. Bush, Bill Clinton and Jimmy Carter, Wednesday, Jan. 7, 2009, in the Oval Office of the White House in Washington. (AP Photo/J. Scott Applewhite)