I may still vote for Gary Johnson.
Obama is competent and I'm not entirely unhappy with what he's done, or what he plans to do, but he has disappointed in several major areas (e.g., wimping out on Camp Delta, half-hearted attempts at investment banking reform, reneged on a promise to deescalate marijuana criminalization, Fast & Furious, etc.). Surprisingly where I think he's done the best is in foreign policy.
Romney's showing me nothing. His stated policy positions call to mind the worst of George W Bush, and his budget and tax proposals are utter nonsense. He's unlikely to gain any attention from me as he runs ever further to the hard right.
Unfortunately, there is no mainstream candidate with much interest in preserving civil liberties. Both have areas they want to protect and others they don't care about, but it's all tactical rather than principled. The closest there was to a real libertarian was Ron Paul, and he's insane. I voted for Paul before it was cool, by the way, so don't bother sending me any pamphlets.
Leaving me with Gary Johnson. I don't entirely agree with him either, but I think he's far and away the most honest in the field at this point. Too bad nobody's ever heard of him.