John Ellis "Jeb" Bush, Ben Carson, Chris Christie, Rafael "Ted" Cruz, Mark Everson, Jack Fellure, Carly Fiorina, Jim Gilmore, Lindsey Graham, Mike Huckabee, Bobby Jindal, John Kasich, Dennis Michael Lynch, Andy Martin, Jimmy McMillan, George Pataki, Rand Paul, Rick Perry, Marco Rubio, Rick Santorum, Donald Trump, Scott Walker.
In addition to those 22, there were also at least 3 more candidates on ballot in certain states, e.g. New Hampshire.