I agree. Check out his "acting" on the political scene in 2000:
On Monday, November 6, the final day of the campaign, Affleck was one of several A-list celebrities summoned to Miami Beach by Miramax Films boss Harvey Weinstein for a late-night Gore rally, just hours before polls opened nationwide. The Gore campaign's last event, a final effort to energize South Beach voters, didn't end until about 1 AM, but Affleck flew back to New York that morning and made a surprise live appearance on The Rosie O'Donnell Show. It was 10:15 when he made his final public pitch from a Rockefeller Center studio, noting that he was "a little bit tired...I've been out getting involved, doing stuff and trying to get people to vote. And that's why I came by here." Also, "Today is the get-out-the-vote day and...I think this is the time to get involved, especially the young folks who are here ... I'm about to go vote," Affleck then said, adding later, "I am personally gonna vote for Al Gore."
As returns came in that night, Affleck told Salon's Amy Reiter, "I'm nervous this evening, but one of the things that's exciting to me is the amount of people who voted. No matter who wins, I think it's a healthy thing for our country that so many voters have come out and participated in the process. Either way, I think the most important number will be the turnout." Amazingly, as The Smoking Gun later discovered, Affleck himself had never bothered to vote.
Damon is smart enough to keep his mouth shut about his true views, he just gives money to A.N.S.W.E.R., MoveOn.org, Americans Coming Together, etc.
He idolizes Noam Chomsky and he and his folks are close personal friends with Communist academic Howard Zinn, author of the vile A People's History of the United States - a book that Will Hunting references in Good Will Hunting, which he wrote and starred in.