Guys,
Tom Cruise and Brad Pitt are both very smart guys when it comes to their careers. They are top actors, with top-tier salaries for a reason, and they are smart enough, and well-enough advised, that they don't want to jeapordize their position in Hollywood.
Right now, America is pretty evenly divided, so no matter who you vote for, you're voting differently than around half of the voters. The lesson of the Dixie Chicks and others has not escaped the attention of actors and others in Hollywood who have ACTIVE careers and want to stay on top, and so the smart ones are electing to keep their mouths shut. It's the safe, smart thing to do, because that isn't going to alienate you from either side.
Not every actor, artist, or musician is that smart, that's obvious. Some are in such a strong position that they can afford to alienate people, and others simply don't care if they do. Still others are going to feel the wrath; their lesson is coming.
But don't assume that just because someone isn't saying who they're voting for that you know who they'll vote for.
-Troy