Paul Waldman at The Gadflyer posts recent Gallup poll results on American beliefs about evolution. They are, of course, depressing, as 45% of Americans appear to believe that humans have existed for fewer than 10,000 years. But by far the most encouraging result is for Catholics: 46% of Catholics believe in evolution, a higher percentage than Democrats (coming in at a paltry 38%). Evolution is a wedge issue - we can use it to divide Republicans from their base, knock Catholics off the fence, and shore up our support among the educated (a statistic I would have liked Gallup to produce: the voter turnout of creationists v. the voter turnout of people that believe in science).
Paul also points to Chris Mooney's blog for more on the topic, which I heartily second.