Really?
Had he kept his peace, and Obama kept flapping his lips about Bain, Obama would have dug himself into a big hole when detailed comparisons to his green energy programs went viral. They are out there now, but the issue is now dying.
This was essentially a backfire, a self-started fire to avoid a bigger fire. The 'vulture capitalist' problem is now an internal Dem vs Dem deal, and not so much a Obama vs Romney deal.
What it proves is that Clinton is a master politician, and Obama is an amateur, and that Krauthammer doesn't always think too deep.
The sentence has a dangling modifier. Carter’s effort fell short, not Reagan’s credibility. Is that what you were questioning?