Below is the analysis of this claim by FactCheck when the accusation was made during the Republican convention. So they've known for over a month it's bullshit, and they continue with it. This seems to be the stuff of McCain/Palin. I think they should be ashamed. I think their supporters should be ashamed, too. If they want to lie and smear, why don't they use new ones, not that which has been demonstrated to be pure crap?

Troop Funding Foul Play

"Lieberman also said that "colleagues like Barack Obama were voting to cut off funding for our American troops on the battlefield." That's a highly misleading claim that McCain also touted in an ad this summer. Obama has voted in favor of war-funding bills at least 10 times since becoming a senator. The McCain camp and Republicans cite one vote Obama cast against a funding bill as justification for their claim – but that vote came after President Bush had vetoed a version of the bill that included a date for withdrawal from Iraq.

"In fact, most Republicans voted against that 2007 war-funding bill Obama and the Democrats supported. McCain was absent for the vote, but he urged the president to veto the bill. As we said about this subject previously, "Based on those facts, it would be literally true to say that ‘McCain urged a veto of funding for our troops.’ But that would be oversimplified to the point of being seriously misleading." And the same goes for Lieberman’s claim at the convention."