If Sarah thinks things were bad this time wait'll she runs again.
No, really, the problem wasn't Couric; it was the McPain campaign for failing to properly control the ground rules of the interview. - Next time She'll be in control, not her worst enemies.
Unfortunately, you are quite correct. IMHO, her resignation will certainly be a campaign issue, as well as the plethora of ethics complaints--both frivilous and substantiated. I also think that more of her SarahPAC donations could become an issue, unless she gets some competent advice in that area.
(Ducking for the incoming Palinista posts hurling the dreaded "PDS" and "Sarah hater" labels) Deal with it, kiddies, and try to have a good day.