Of all religious groups in America, Evangelicals are the least bigoted.
I don't even know what this means. Firstly, I don't know how you would arrive at that conclusion. Secondly, I'm not quite sure it's bigotry to vote against someone because of their religious beliefs, whether they be Muslim, Evangelical, Catholic, or Atheist, as long as it's based on the specific beliefs of the individual and not from assigning presuppositions about what a particular group believes to that individual.
As for the question, I'm not exactly sure that it helps him. The type of voters Romney needs to attract in VA and NC aren't going to be making their decisions based on his veep's accent.