In this Nov. 24, 2008 file photo, David Axelrod listens to President-elect Barack Obama during a news conference in Chicago. Axelrod has labeled Sen. Hillary Rodham Clinton, D-N.Y., a "demonstrably able, tough, brilliant person. (AP Photo/Charles Dharapak, File)

David Axelrod, left, and Robert Gibbs, Campaign advisers to Democratic presidential hopeful, Sen. Barack Obama, D-Ill., talk with the media while en route to a campaign rally in Des Moines, Iowa, Tuesday, May 20, 2008. As the marathon Democratic primary campaign nears an end, Obama's staff is on the verge of vindicating its belief that the eloquent black freshman senator was a unique candidate who could win the Democratic nomination. The band of Obama loyalists who imagined that could happen have stunned even themselves with their success against Hillary Rodham Clinton. (AP Photo/Chris Carlson)

David Axelrod, left, and Robert Gibbs, Campaign advisers to Democratic presidential hopeful, Sen. Barack Obama, D-Ill., talk with the media while en route to a campaign rally in Des Moines, Iowa, Tuesday, May 20, 2008. As the marathon Democratic primary campaign nears an end, Obama's staff is on the verge of vindicating its belief that the eloquent black freshman senator was a unique candidate who could win the Democratic nomination. The band of Obama loyalists who imagined that could happen have stunned even themselves with their success against Hillary Rodham Clinton. (AP Photo/Chris Carlson)