He already has. Levin threw the constitution out the window in his support of Cruz, and the few million dollars in establishment money for his fake book sales.
He still has the corrupted half of his audience; he will never regain the trust of the conservative half that left him for good.
I know it’s against all known laws of man and nature to support a candidate who is not Trump and Levin certainly should lose all his audience as well as be burned at the stake, so why even bring it up?