Florida law forbids a candidate's name from appearing twice on the same ballot. So if Marco Rubio ends up making a serious bid for president, he'd have to give up his seat in Congress. This could set up a very interesting four years in Florida politics, where a very likely competitive and open Senate election is followed just two years later by an open gubernatorial race after a term-limited Rick Scott vacates office.
So which politicians are already lining up for a promotion in the next four years? Here's a handy guide. Of course, keep in mind that Florida politics tend to be completely unpredictable. There's no accounting for a young South Miami upstart coming out of nowhere or a rich old guy buying himself a seat and ruining everyone else's best-laid plans.