Kucinich vs. Paul? Paul.
Clinton vs. Paul? Paul.
Gravel vs. Paul? Paul.
Napolitano vs. Paul (in the primaries I guess)? Napolitano.
Kucinich vs. Rubio? Probably Kucinich.
Clinton vs. Rubio? Ouch. Maybe 3rd party?
Clinton vs. Bush? Wouldn't that be ironic?
My main point is that Rand is better than most other people, even if you don't like some of the stuff he's done.