With only 10 days before the Nov. 4 election day, U.S. Democrats are pushing forward with party's unity by adding former President Bill Clinton's popularity to its presidential candidate Barack Obama's campaign, according to a TV report on Sunday.

Clinton Foundation confirmed to CNN that the former president would, for the first time, campaign with Obama in Florida on Wednesday.

Clinton has questioned Obama's experience and credibility to take the lead of the country during and even after the Democratic presidential primary which his wife, New York Senator Hillary Clinton, lost.

U.S. Democratic presidential candidate Senator Barack Obama (R) joins Senator Hillary Clinton (C) and former President Bill Clinton at a memorial service for Rep. Stephanie Tubbs Jones in Cleveland, Ohio, August 30, 2008. [Xinhua/Reuters Photo]

After conceding to Obama, Senator Clinton announced to join in her former rival's campaign and do all she can to help with his bid for the White House.

Senator Clinton has also campaigned with Obama recently in Florida, a key battleground in November.

The Clintons appeared with vice presidential candidate Joe Biden and his wife, Jill, in Pennsylvania, where both of the two families have roots.

(Xinhua News Agency October 27, 2008)