Obama speaks to a crowd estimated at 75,000 during a rally at Waterfront Park in Portland, Oregon, May 18, 2008. It was one of the largest crowds anyone could remember a presidential candidate ever drawing for a single event. © 2008 Getty Images-Justin Sullivan

Photographic series shows Barack Obama and his wife, Michelle, onstage during his election night rally at the Xcel Energy Center in St. Paul, Minnesota, at the end of the 2008 Democratic party primaries, June 3, 2008. © Emmanuel Dunand/AFP/Getty Images

Obama walks back to his office on Capitol Hill after a series of votes on the Senate Floor, May 13, 2008. © Tim Sloan/AFP/Getty Images