Allahpundit nods along:
A thought experiment from Dan Foster: What if Gingrich had spent the past six years running for president and entered the primaries as the "inevitable" nominee, and then Bachmann, Perry, and Cain had all imploded? Would Romney now be surging on the strength of anti-Newt sentiment? If not, why not?
Weigel notices that Democrats aren't wasting their breath:
If you're on the DNC/Obama email lists, you notice that the other team doesn't bother attacking Newt. This isn't complicated. They worry about Romney. They don't worry about facing Gingrich.