I think Ron Paul has an excellent chance of winning the Republican nomination. Many people from other parties are registering Republican to vote for him in the primaries. I am one of them.

CNN poll:
Election Center 2008 - Election & Politics News from CNN.com
Winner: Ron Paul

MSNBC poll:
Interactive: Rate the candidates - The Debates - MSNBC.com
Winner: Ron Paul

YouTube - Sept. 5 Fox Debate Poll - "Ron Paul Won Overwhelmingly"