raving lunatic

“We’re not like the raving lunatic Republicans,” she said.

“I hope he goes to every swing state and gives his raving lunatic speech everywhere around the country.”

One of them becomes a raving lunatic right-winger and the other one is left of center and humanistic and liberal.

I don't know whether he was just trying to be facetious or if he actually worried that I walked around campus acting like a raving lunatic.

Also make sure you don’t bring the raving lunatic that takes things too seriously.