You know it's going to be a good debate when...the leading candidates start to accuse one another of lying BEFORE the debate. That's precisely what's happened in advance of tonight's Republican debate on CNN, featuring questions submitted via YouTube.

Rudy Giuliani is accusing of having raised taxes, not cut them as Romney has claimed, and of supported Hillary Clinton-style health reform. Romney says Giuliani has a "fact problem" of this variety: "he makes them up."