There are quite a few credible conservatives who can speak, lead and think but there isn't one out there right now that can win.
Hope Texas John Cornyn is in that list. He has a good resume and is all that. But he doesn't have a machine behind him plus the rest of the country may not be ready for another Texan. :o) Maybe in '12.
I wouldn't walk across the street right now to see any of the GOP presidential hopefuls. Hoping it starts looking better real soon.