Ron Paul is the only candidate in the election with a voting history to back his beliefs. He may say some crazy things, but at least he's honest, and on the up and up.
I'll take a dishonest politician who votes for the right things over an honest one who is wrong any day of the week. Paul is a nut. The fact that he's right about a handful of things doesn't mean much: stopped clock, yada yada.
I don't think that someone is a liar because they don't always vote in line with their beliefs. There are good reasons for occasionally voting for things that are not 100% inline with what your goals are for one particular issue. Sometimes compromises need to be made in one area to make progress in another.