"But if people can hear him directly, it makes it harder for us to convince them he's lying!" Literally, the left's worry: how they can't control the message if they're not the intermediary.
What's scary is that they loved Clinton, hated Bush, fawned over Obama, and are pathologically frothing-at-the-mouth loathing of Trump. The amplitude of their emotional swings is increasing with each party change in the White House. Extrapolate that forward to the next Democrat in the White House...