Hillary Clinton will campaign for her former rival Barack Obama in his U.S. presidential bid in Nevada and Florida, Obama's campaign said Tuesday.

Clinton, a New York Senator, will hold rallies and voter registration drives Friday in Nevada and on Aug. 21 in Florida, two swing states which are expected to play important roles in the November election.

The two former rivals for the Democratic presidential nomination were last seen on July 10 when they showed up at a fundraising event together.

Since she conceded to Obama in early June, former First Lady Clinton has vowed to "do everything I can and everything I'm asked to make sure he (Obama) takes the oath of office on Jan. 20, 2009."

Her commitment was welcomed by Obama who is seeking the party’s unity, especially support from Clinton's voters in the primary season, to beat his Republican presidential rival John McCain.

In return, Obama has promised to help Clinton pay off her debts left behind by her failed bid for the White House.

(Xinhua News Agency August 6, 2008)