Ben Carson, a retired neurosurgeon and Tea Party favorite, announced on Sunday. Carly Fiorina, the former Hewlett-Packard chief executive, is expected to jump in today. Mike Huckabee, a former Arkansas governor, is expected to announced on Tuesday. Texas Gov. Rick Perry is a expected to get in the race in June, according to his supporters.
In the wings, Jeb Bush and Wisconsin Gov. Scott Walker are expected to announce their candidacies. Gov. Chris Christie of New Jersey is seeing if his George Washington Bridge indictments have ruled out a 2016 run for the White House.
Already on the campaign trail are Sen. Marco Rubio, Sen. Ted Cruz and Sen. Rand Paul.