The ugliest, most illiberal political ad of the year may be this one, from Kentucky Democrat Jack Conway:

I actually don't doubt the implication of the ad, namely that Rand Paul harbors a private contempt for Christianity. He's a devotee of Ayn Rand, who is a fundamentally anti-Christian thinker. And much of Paul's history, which he is frantically covering up in an attempt to pass himself off as a typical Republican, suggests among other things a deep skepticism about religion.

The trouble with Conway's ad is that it comes perilously close to saying that non-belief in Christianity is a disqualification for public office. That's a pretty sickening premise for a Democratic campaign.