Crist fallout: RNC wants pledge that candidates won't quit the party

“I will run and campaign as a Republican for the office named above,” the pledge reads. “I will not oppose the Republican nominee for the office named above through the time of the election specified above, whoever that may be. I will not in any way endorse or support any other person for the office above at any time before the election specified above who is not then a Republican candidate.”

The pledge indicates that candidates who fail to follow the pledge would have to pay back any RNC money they have received, as well as return the contribution of any other donor who requests a refund.