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There’s a finite pool of talent for presidential campaigns available, and in large, multi-candidate fields there’s intense competition for them. You see this before every presidential cycle when there’s an open shot at the nomination, additionally, even though President Trump starts as the front-runner for the Republican nomination, there’s a lot of trepidation among staffers about working for him. He’s been volatile in the past, and staff haven’t always ended their service with him on great terms. So there’s a desire to look at some of the other candidates in the field and jump on board.