The only ones on that list that would have even a chance of winning the general election would be Jeb Bush and Scott Walker. I don't think Rand Paul could win the general, and the rest would do good to pick up 10 states.
Of the possible GOP candidates, these are the ones I think stand the best chance of actually winning in 2016 should they run:
and possibly should he actually decide to run, Jeff Flake.
I don't get the Republican primary voter mindset that makes them think some total nutjob like Ben Carson would stand even the most remote chance of ever winning a general election in today's America.
"You're the only person that decides how far you'll go and what you're capable of." - Ben Saunders (Explorer and Endurance Athlete)
(You KNOW its bad when Romney is currently running 15-20 points higher than anyone else...and he has said he won't run. Clearly, the voters do not like ANY of those mentioned as possible contenders for the 2016 GOP nod).
Women (Nasty or otherwise) are going to be the reason that Donald Trump is NEVER President!