That's a good point Not to say there aren't intelligent actors but I remember watching Brando on Larry King about 10 years ago and he sounded like a complete imbecile. This is possibly the greatest actor of all time. The high point was where he corrected King's correct quote of Coleridge (a suspension of disbelief) with his own incorrect one (a suspension of belief).
No, there aren't any good intelligent actors. Let's not sugar coat it. Really. They're pretty dumb as individuals. What they have -- either by training or gift is a mechanism that allows them to wipe away who they are. Try that some time and you'll see have difficult it is. Read a piece of Shakespeare out loud -- Richard III, say-- and forget who you are -- all self-awareness. Maybe self-awareness is tied to intelligence, I don't know.
Brando Trivia Bonus: during Brando's run of Street Car on Broadway, the critics were enraptured by his performance. Particularly, they loved the way he would cast his eyes upward when delivering some of his lines. A brilliant acting choice? No. He couldn't remember all of his lines, so the director had cue cards up on the ceiling.
Michael Douglas is a long time supporter of the UN, promoting a UN initiative on gun control worldwide. He has been quoted as saying "Our focus in this country is on gun control."
He has also contributed heavily to the Bradley and Gore campaigns.