After recent work on congressional deals, Biden looks like a more serious contender in 2016, if he chooses to run.
Paul is heir to a movement led by his father, former Rep. Ron Paul of Texas, though the senator seems to want to broaden his appeal and work within the GOP rather than rely primarily on libertarians (and Libertarians).
Depending on what happens in 2014, a number of other Republican governors could also look at a run, possibly Michiganís Rick Snyder or Ohioís John R. Kasich, who has run for the White House before.
And the preliminary list obviously lacks any women, so New Mexico Gov. Susana Martinez and New Hampshire Sen. Kelly Ayotte (and possibly even South Carolina Gov. Nikki R. Haley, if she wins re-election next year) are likely to receive mention, though right now the GOP lacks a woman who is ready to be a top-tier presidential contender.
Of course, over the next two years, many politiciansí stocks will rise or fall, so some names on the lists will drop off and some not receiving mention now surely will be added. Obama can testify to how quickly things can change.
Stuart Rothenberg (@stupolitics) is editor of the Rothenberg Political Report (rothenbergpoliticalreport.com).