Defeated White House hopeful Hillary Clinton is not seeking to run as Barack Obama's vice presidential nominee, her campaign said.

A statement issued by her campaign said that while Senator Clinton has made clear throughout this process that she will do whatever she can to elect a Democrat to the White House, she is not seeking the vice presidency.

They added that the choice of a vice-president is the choice of Senator Obama's alone, the statement said.

Hillary Clinton announced today that she will end her White House bid and declare her support for Barack Obama on Saturday.

It draws the curtain on a gruelling 16-month nomination fight.

Senator Clinton will publicly back Mr Obama on Saturday and pledge to work for the party unity in the Democrats general election race against Republican John McCain.

The New York senator will host an event in Washington to thank her supporters and express her support for Senator Obama.

The event was originally planned for Friday but the day was switched to allow more supporters to attend.

Mrs Clinton has not decided whether to officially close the campaign or suspend it, allowing her to keep control of her delegates to the nominating convention. She spent much of the day talking to supporters, many of whom urged her to halt her bid now.

Mr Obama attended two fundraising events in New York City last night and acknowledged her decision.

The Illinois senator, set to be the first African-American candidate to lead a major US party into a White House race, announced a three-member team to head his search for a running mate as he began the task of unifying the party the day after clinching the nomination.

John McCain proposed that Mr Obama join him for a series of joint summer town hall meetings across the country.

Mr Obama's campaign manager called the idea ‘appealing’ but proposed format changes and made no immediate commitment.

Caroline Kennedy, daughter of the late President John Kennedy, will vet prospective running mates along with former Deputy Attorney General Eric Holder and Jim Johnson, former chief executive of the mortgage lender Fannie Mae, who performed the same task for Democrats John Kerry in 2004 and Walter Mondale in 1984.