If Romney had the right-wing authoritarians in the bag, he could simply allow his surrogates to keep the "unAmerican Obama" balloon in the air for him.
But he doesn't have them in the bag yet, just as RWA voters were unenthusiastic about John McCain in 2008. Without their unusually high turnout, McCain lost and so too will Romney.
Now Romney has to earn credibility with the knuckledraggers by stomping in the "unAmerican Obama" shitpile.
Every time Romney does that, unfortunately for him, he also alienates a certain number of undecided voters who know for sure that issue is a bunch of crap, and motivates others to make sure they are registered to vote against him.
RWAs comprise 23% of the voting population and turn out in numbers that amplify their importance far beyond that. No modern Republican can win a statewide or national election without their unquestioning support, which is why the GOP has drifted ever further to the right.
Romney now has to risk losing reasonable voters to gain the trust of the Brownshirts. Whatever you think of the strategy, the time for Romney to have won their support has long since passed.
The fact that Romney is still trying to win the support of the Republican base, despite pouring in massive money, time and effort into gaming the primary system in his favor, means he has already failed in a tangible and highly significant way.
As of today, I'm adding +4 electoral votes to President Obama in my prediction for November, now up to 413.