Defeated Democratic presidential candidate Hillary Clinton urged Democrats to unite behind Barack Obama on Tuesday, calling herself a "proud supporter" of the presidential candidate.
The New York senator, who suspended her presidential campaign in June, was introduced by her daughter Chelsea Clinton to a rousing round of applause.Fresh polls showing more than a fourth of Clinton backers say they will abandon party loyalty and vote for McCain in the November 4 election have clouded the Democratic convention, where Obama is set to be named the party's presidential nominee.
