Other conservative or libertarian candidate
I'd rather vote for Colin Powell than for any of the other choices presented.
This, I think, national legislators would have a better understanding of. Our Congressmen and Senators have to work together and debate with each other on national issues, and much of it get done through compromise and understand (though not necessarily agreement) of the other side. So I think our Congressmen and Senators have a better understanding of national issues than governors do.
So I would prefer legislators with national experience over exeuctives who have nothing higher than state-level experience.
Don't be coy. You know the president drives a lot of the negotiations, or lack thereof, in that debate.the Healthcare Bill is a matter of compromise within Congress, not the President.