In a contest against Barack Obama, Romney is somewhat inoculated against ancestral polygamy issues by the fact that there is some evidence that Obama’s own father was a polygamist. The Mormon policy of denying priesthood to black men pre-1978 is a likely bigger problem, especially against a black opponent. Still, it’s probably not a knockout punch, because it’s hard for the democrats to claim the moral high ground on this when so recently they stood by in silence for several years conveniently ignoring the racist (KKK) past of Senator Robert Byrd.
Byrd never ran for PREZ...
...with 24/7 coast-to-coast & intl media full-press coverage...
...in an internet era where media claims are easier to validate.
It wouldn't be a "knockout punch" only 'cause Romney wouldn't ever really even be in the ring. The whole floor would be pulled out under from him before the bell sounds!
The biggest potential loser? (The GOP!)
You don't know that a double standard exists between rats and republicans? The media protected Byrd, often by their silence. It's only when democrats' misdeeds are egregious (Anthony Weiner) that they will toss the democrat under the bus.
If Romney becomes the nominee, all their ammo will be tossed against him, including the cult he is a member of.