The only true political crime: being conservative
With the crazed reaction to Senator Craig's screw-up (pun intentional), it's easy to forget that the former Governor of New Jersey Jim McGreevey has admitted to engaging in anonymous sex in highway rest stops and that a Democrat Congressman is currently charged with assault and battery, and another is under indictment for corruption. And those are just off the top of my head.
There are plenty of examples of corruption and other wrongdoing in both parties, but only one parties offenses make the front page. Seems like the only true crime in American politics is being a conservative. All else can be forgiven.