Here is some more information covering his record thru 2002. I'd say he was more on the pro-side of rights for illegal aliens. I hope someone asks him whether he favors McCain's Senate bill?
http://profiles.numbersusa.com/improfile.php3?DistSend=TN&VIPID=743
Unlike Hunter and Tancredo, Thompson has the ideas to unite the party and the charisma to win. I'm in the Giuliani camp now, but I would definitely consider defecting if Thompson threw his hat in the ring.