Democrat John Edwards is endorsing former rival Barack Obama, fresh signs of the party establishment embracing the likely nominee even as Hillary Rodham Clinton refuses to give up her long-shot candidacy.

Barack Obama on Wednesday began to formulate a strategy as the presumptive Democratic nominee, after strong performances on Tuesday. Meanwhile, Hillary Clinton was urged by a supporter to drop out of the race.

Democratic hopeful Hillary Clinton became the subject of Internet hilarity on Thursday, after video was posted online that showed her fussing with a coffee machine.

Democratic presidential candidate Barack Obama on Friday blamed the nation's expensive gasoline on U.S. lawmakers, while rival Hillary Clinton challenged him to a debate.

Hillary Clinton won the "do or die" Pennsylvania primary Tuesday night, defeating Barack Obama in their riveting race for the Democratic presidential nomination.