Mark Warner—Virginia

Former Governor Mark Warner is hardly a stranger to the national political scene. Aside from the fact that for geographical reasons if nothing else, you can't be in charge of Virginia without having to be directly involved in the affairs of Washington, DC (and vice versa), he was widely expected to run for President in November and his name still comes up in nearly all discussions of potential 2008 Democratic VP candidates. It's hard to think of anyone who's more qualified to take over the state's open Senate seat than Mark Warner is.