Here's a sign that Santorum is a threat to Romney.

Jen Rubin, Mitt's ever-reliable blogging mouthpiece, has turned on him.

She actually was very complimentary to Santorum early on, but no more. He's now a genuine nemesis to Mr. Electable, so out comes the shiv. No longer an appealing populist, but a fire-breathing extremist.

Intellectual integrity is overrated in politics, and political blogging, it seems. Or maybe it's just another example of the dangers of prolonged exposure to Romnium.

I think the EPA needs to look into this, stat.