In another indication that the Obama camp is shifting gears into the general election campaign, Joe Biden told the Washington Times that Obama has approached him about being a campaign surrogate. Biden has not publicly endorsed either of the remaining Democratic candidates.

"He has asked me to play a more prominent role - not in an administration, in the campaign," Biden said, "meaning would I be more available, would I travel with him occasionally, and I said once he gets the nomination, if he gets the nomination, then I'll do whatever he wants."