Hilary Clinton is to take to the stage tonight as Tuesday's principal speaker at the Democratic National Convention. The Obama team will be hoping that she says enough (and makes it believable) to bring her flock of die-hard HC supporters over the Obama.

Some have suggested that Hilary may not be the problem, enter Bill. Bill Clinton will be one of the principal speakers on Wednesday, with Senator Joe Biden. The Obama campaign is likely to be biting their nails in anticipation of that one. Only a few days ago Bill Clinton was heard complimenting McCain's environmental credentials.

Tuesday's keynote speaker will be Mark Warner (right), former Governor of Virginia. However, he may be trouble for the Obama campaign himself. Warner is fighting for the seat of retiring Republican Senator John Warner and is doing so by painting himself as a centrist. In trying to woo independents, his words tonight may not go down to well with ordinary Democrats.

Pictures: Hilary Clinton in New Hampshire: Marc Nozell - http://commons.wikimedia.org; Mark Warner in Philadelphia: Forward Together PAC - http://commons.wikimedia.org