Um, Ron Paul is running as a Republican right now. That means you can pick him in the Republican primary - and he could become the Republican candidate for president. When I read some things on this forum, it seems like people think he's running for president in another party. He is a Representative to Congress in the Republican party. Just so you know :)
This has nothing to do with his chances at getting the Republican nomination - I'm just trying to clarify something technical here :P