IDC if Ron Paul can't win. That's not my point in voting for him, plus, it's definitely not a vote for Obama. I won't vote for Obama. If I vote for anyone other than Paul, it will Romney, but I was an Obama voter in 2008, thus, I see it more as a vote taken from Obama. And, I have a feeling, a lot of Ron Paul supporters, esp the young ones, are past Obama voters.
As far as voting restrictions, I know in Ohio, I can vote for whomever I want in a write-in, and, these votes are not "thrown out." I've never heard of restrictions on write-in's in a general election. If anyone here does have a state with screwy write-in laws, post that information here so others that may be in your state and considering writing-in will know.