To be fair, we couldn't get a liberal nominated or elected in 2008, either. This country likes moderates. Bush was an abberation, not the norm. Moderates likes Obama and Romney are what the country wants. I suppose the majority feels that rocking the boat is the most dangerous thing of all right now. And I think it's fair to say that people who feel really strongly about either liberal or conservative ideas are actually in the minority. Most people are moderates, who don't want extreme solutions to our problems. They don't want Laissez Faire economics, or really progressive socialism, or strict religious morality, or a completely permissive culture. They want something in the middle. We here at DP are unusual in that we care so much. We are the vocal minority. As much as we wish the rest of the country would rally behind our banners and get passionate, they won't. They want moderates so that their lives won't suddenly get more complicated.
So no, conservatives won't lose either way, because conservatives are regular working stiffs, not "real conservatives" who obsess about their guns and the right to totally and completely control their property. And liberals won't lose either way, because liberals are also regular working stiffs, not "real liberals" who want to solve everyone's problems and make everyone get along perfectly all the time. Liberals and conservatives are the left and right side of moderate. And they don't care that much. They'll be fine under Romney or Obama. They weren't so fine under Bush, since Bush was not moderate. And they probably wouldn't be so fine if I were president, either, since I am certainly not a moderate. Actually, the majority of Americans probably wouldn't vote for any of us. We're all fairly extreme.
The silent majority will be fine. It's the vocal minority (us) who will get upset.