Staying quiet on Benghazi was a bet. It seemed right at the time, but it turned out to be a mistake. Could Romney have lost any worse if he had pounded Obamugabe on it?!
It was a lose-lose situation on Benghazi. If he continued blasting away on Benghazi, the media would take it as him simply being obssessed and hateful about Obama instead of wanting to be president. Second, if he moved on, the media would pound any number of lies they wished on the whole ordeal. The other issue, which I take to people thinking other candidates could have done better, is the fact that frankly, they all had their own lousy performances in debate and along the campaign trail.