Duncan Hunter. Fred Thompson. Tommy Thompson. Newt Gingrich.
They are only unrealistic because people like you say so and don't support them. You send the message that the RNC doesn't support conservatism. Your faith in conservatism is pretty shallow if you can't express support for a conservative over ten months out from the primaries when it doesn't cost the party a thing to do so.
Again, they are not exactly motivating the party. We need someone new and interesting, someone who can overshadow Rudy.