Ok first, I'm about as left as they come, but Sean Penn is a bit much for me, and he is clearly saying that people should vote out Bush for humanitarian reasons. It is ludicrous to say that if you think he is saying that, you are on the right.
Also, he does seem mad at them for not telling people to educate themselves, in this line: "encouraging that there's "no shame in not voting" "if you don't know what you're talking about" (Mr. Stone) without mentioning the shame of not knowing what your talking about, and encouraging people to know."
But to follow up with the line: "Not so well, to encourage irresponsibility that will ultimately lead to the disembowelment, mutilation, exploitation, and death of innocent people throughout the world. The vote matters to them." is an obvious knock against Bush, and any liberal who says "he didn't explicitly say it" better never complain about anything this administration does, since they don't explicitly say a lot of things. Read that line again. Where in there does it say an informed person could vote for Bush in Sean Penn's world?
These celebrities bug me. They claim their message is "Get out and vote!" when their message always is "Get out and vote AGAINST BUSH!" It is fine to hold that opinion, but they are hiding behind a wholesome everybody needs to vote message. Just come out and state your opinion. Do explicitly say it.