Sen. Hillary Clinton introduced herself as a "proud supporter of Barack Obama" at the Democratic National Convention on Tuesday as she called on her party to rally behind him. "Whether you voted for me, or voted for Barack, the time is now to unite as a single party with a single purpose. We are on the same team, and none of us can sit on the sidelines. This is a fight for the future. And it's a fight we must win together," she said. "....Barack Obama is my candidate. And he must be our president," Clinton was quoted as saying by CNN.