The independent vote wasn't enough — there was plenty of baggage with Romney, such as never coming clean about his religion, which many conservatives were skeptical about. Also, he was too slick -- the other Republican candidates ALL disliked him very much. It must have impressed Republican voters the same way.
Thompson didn't get a grassroots machinery started, he never gave himself a chance.
Giulani ran a incredibly stupid campaign.
I'm a conservative, not a big McCain fan, but he ran hard, and I give him credit. I don't think the Democrats put him there — the other candidates weak campaigns did...
That's why I felt like it was absolutely appropriate for a conservative to meddle with the Democrat primary if they so chose. OTOH, if there's an effort to close the primaries in Texas, I wouldn't really have a problem with it, but I know that any such effort would probably be led by Dems who would have themselves crossed over had the primary been earlier.