I don't want to sound like I'm slamming actors in general (see post below). To be fair, I want to point to George Clooney. Now, I first have to say that I disagree with him, politically, on just about everything. But I do respect him. By all accounts, he is polite and respectful to those with whom he disagrees, and he seems--to me, at least--to be a fairly nice guy. But what really impresses me about him is that he puts his Clooney where his mouth is. If you haven't heard by now, Clooney was arrested today outside the Sudanese embassy while protesting the atrocities perpetrated by the Sudanese government upon its own people (something Mr. Clooney and I agree on). It's one thing to narrate a video, or donate a portion of your wealth to a political candidate or SuperPAC, but it's another to sit yourself down, get arrested and booked to draw attention to the problem. That's not to say that he (or any of us) couldn't get even more involved, but it's more than most do.
UPDATE: According to the article linked to above, Clooney has himself traveled to the region. Good for him. I should have read all the way through before writing the post. Oops.