We all know who you are talking about, just like everyone know what "guy" I'm talking about.
That being said, I believe there has been an increase in genuinely dumb people in American politics in the past ~15 years.
Nixon for example: malicious but very very smart (eg wrt China).
Reagan: not a razor, but fundamentally good-willed (see for example his interactions with Tip O'Neill from the other party)
Dim and malicious is of course the worst of all. Not least because such people will attract the smart and malicious like flies.
Earlier:
White House Preps Order to Punish Banks That Discriminate Against Conservatives
Andreessen/Horowitz talk about it here
duxup•2h ago