Not everyone who votes for Romney will be white, nor will all the white voters be motivated by racial concerns. The thing is, 4 out of 10 people in America don't vote in the prteedsniial election. That was true even in 2008 when we saw the highest voter turn out in decades. The people who are most likely to vote are older whites, and they are the ones most likely to respond to some racial dog whistles. That, coupled with the fact that the states are set up as "winner take all" means that Romney chances are better than you describe them.