Republican Congress more Corrupt than Democrats?

Kevin Drum makes a strong case by summarizing the Boston Globe 3-part series. It seems clear to me that both Dems and Reps have been corrupt in the past, and thus they both share the blame. That being said, it seems that present-day Republicans are taking the corruption and sleeze to unprecedented heights. On most objective measures they are more than twice as likely as Dems to employ dirty tactics.