Literally every republican with a stake (i.e. the FCC board, and those responsible for nominating/confirming them) endorses this policy. It's literally the party line position.

I think this citation needs to go the other way: which republican do you know who have come out in favor of the current net neutrality regime. I honestly can't think of one.

Your original subject is "His core base", which was what I referenced. You are talking about party politicians. In this situation, we may both be correct.