From CNN
Sam Feist, CNN's political director, also confirmed the decision to me. "As we got closer to the voting, we made a decision to make sure that all the analysts that are on are non-aligned," Feist said, adding that the decision had been made around the start of December. "Carville and Begala are two of the best analysts around and we look forward to seeing them on CNN plenty of times in the future, once the nominating process has ended."
