A weekly mathematical survey of dubious behavior that measures, on a scale of 1 to 100, just how low a person can go.

To the tune of "White Christmas," conservative radio host Rush Limbaugh sings that he's "dreaming of riots in Denver," site of the Democratic convention. Score: 10

During a live radio interview, Bill Clinton says the Obama campaign "played the race card on me," then claims the very next day that he said no such thing. Score: 58

Over public objections from her own national party and likely nominee John McCain, North Carolina GOP boss Linda Daves airs a race-baiting, anti-Obama attack ad. Score: 63