My preferred list includes some who won't run:
1. Cheney
2. Jeb Bush
3. A Conservative Military: Franks, Ollie North
4. Allen or Tancredo or Frist or anyone with a conservative ACU rating of 80% or higher.
5. The Rinos: anyone with an ACU rating of 70% or lower.
Imagine a Giuliani-Rice ticket. The Dems would just crawl into a hole to begin a painful 4-year planning session, in hopes of having a chance NEXT time. And Condi could get Rudy enlightened re the Second Amendment.