Strike one: He's not leading man material.
Strike two: It's hard to take him seriously. He's not pushing any big-ticket initiatives.
Which is also a good thing. He seems to genuinely believe in small-government conservatism, up to and including a robust Federalism. I like that. But I have this gut feeling that no President can actually function with that philosophy.
Update: Whups, forgot about...
Strike three: He's a former Senator.
Guess I won't be voting for him after all.