Christie is announcing tomorrow. That brings us to what, 20 potential candidates?
Bush, Rubio, Cruz, Santorum, Huckabee, Graham, Jindal, Perry, Trump, Carson, Fiorina, Pataki, and Paul are all confirmed. Walker is all but certain to run, which with Christie will bring it to 15. Kasich would be 16. Ehlrich, Gilmore, and King would get us to 19. 20 could be a last minute surprise if someone like Sarah the Quitter suddenly decides America "needs her."
What fun those debates will be.