In The Village Voice, to their credit:

I found not only that I didn't trust the current government (that, to me, was no surprise), but that an impartial review revealed that the faults of this president—whom I, a good liberal, considered a monster—were little different from those of a president whom I revered.

Bush got us into Iraq, JFK into Vietnam. Bush stole the election in Florida; Kennedy stole his in Chicago. Bush outed a CIA agent; Kennedy left hundreds of them to die in the surf at the Bay of Pigs. Bush lied about his military service; Kennedy accepted a Pulitzer Prize for a book written by Ted Sorenson. Bush was in bed with the Saudis, Kennedy with the Mafia. Oh.

And I began to question my hatred for "the Corporations"—the hatred of which, I found, was but the flip side of my hunger for those goods and services they provide and without which we could not live.

In short, David Mamet is, in his own words, "No Longer a Brain-Dead Liberal".

(And of course, I disagree with claims that Bush, not Richard Armitage outed Plame, stole the election, etc. -- but so be it.)

Seems his religion had something to do with it:

Prior to the midterm elections, my rabbi was taking a lot of flack. The congregation is exclusively liberal, he is a self-described independent (read "conservative"), and he was driving the flock wild. Why? Because a) he never discussed politics; and b) he taught that the quality of political discourse must be addressed first—that Jewish law teaches that it is incumbent upon each person to hear the other fellow out.

(How dare he fail to discuss politics at synagogue! Isn't that our religion?)

And so I, like many of the liberal congregation, began, teeth grinding, to attempt to do so. And in doing so, I recognized that I held those two views of America (politics, government, corporations, the military). One was of a state where everything was magically wrong and must be immediately corrected at any cost; and the other—the world in which I actually functioned day to day—was made up of people, most of whom were reasonably trying to maximize their comfort by getting along with each other...

God bless his Rabbi. (And he's utterly right about the discourse problem.) Mamet admits he then tried to listen to what his political opponents said. (Bad move, if you wish to keep your liberalism intact. That's what happened to me, anyway.) Good heavens, Mamet even calls Thomas Sowell "our greatest contemporary philosopher"! (NB: I'm reading one of Sowell's books (Basic Economics) right now. Incredibly lucid.)

Well, another one bites the dust. I suspect he'll be happier as a result.