You've gotta think a Governor will get the nod. Bill Owens has been groomed but isn't a sure thing. Maybe not though... a few solid candidates in the Senate. Frist wants it, Hagel probably does, Allen definitely does.
Welcome to the forum.
Not sure about Hagel, he may have to wait until 2012. Definitely a President in the making, though. Frist looks more like a running-mate to me; I can envisage a Giuliani/Frist ticket for 2008. But of course there's the question over whether mainstream Republicans would accept a pro-choicer like Rudy as their candidate.