Although the Republicans have several strong contenders for this title (Tom Coburn of Oklahoma springs to mind immediately, as does Sam Brownback of Kansas), I think Little Ricky Santorum truly deserves the prize. Santorum has been trying to blame the Catholic Church's pedophilia scandal on liberals. Yes, it's not the fault of the Church's outmoded celibacy requirement, it's the liberal culture of places like Boston that has induced sex-offending priests to ruin the lives of the children with whom they interact. Santorum has absolutely no shame. He is perhaps the sickest and most brazenly dishonest officeholder in the entire GOP, and you gotta go some distance to win that race. He's in trouble in his re-election race already. I say let's help flush him next year.
Here's an excellent response to Santorum's preposterous lies.
UPDATE: John Kerry responds to Santorum's grotesque lies.