Frum zeros in on it:
It's not the infidelity. It's the arrogance, hypocrisy, and – most horrifying to women voters – the cruelty. Anyone can dump one sick wife. Gingrich dumped two.
Josh Marshall nods:
There are so many reasons why Gingrich is the lead balloon of presidential politics, but Frum really has this right that the infidelity thing is just something he cannot survive. Not because voters won't tolerate infidelity — in many circumstances they will — but because the pattern with Gingrich shows a level of hypocrisy, cruelty and emotional immaturity that most people won't accept in a president.