Believe it or not, I'm thinking the opposite. Look at the updated demographics on my profile page. Note that a majority of people who worship weekly, both Catholics and Protestants, all fell in support of McCain over Obama, with the glaring exception of blacks and hispanics.
Also consider that none of the weekly goers even approach the "non-religious" demographic, 75% of which voted for Obama. The most "evangelical" minded among us voted exactly the opposite, favoring McCain by 75% instead. That's evidence in support of the idea that the faithful are being (mostly) different from the world, if only by comparison.
I think there's a reason why we didn't make a difference in the overall vote, like we (supposedly) did in 2000 and 2004. Year-by-year census numbers show that the number of believing, practicing Christians in this country has been steadily declining for decades. I think we have finally shrunk to the level where we've lost any influence over the culture, morality, or politics at large. IMO that's what the 2008 vote demographics are saying.
We can't influence the ballot box, until we start changing the hearts and minds of the unbelievers among us. We'll remain a statistical oddity, "strangers in a foreign land" (Exodus 2:22, cf Jeremiah 5:19), until we increase our numbers (and I don't mean simply filling seats in the pews). We Protestants and Evangelicals need to take the Great Commission and all Ten Commandments seriously again.
A good point. The challenge is to convert the "Sunday go to meeting Christians" into "7 day a week Christians", as well as evangelize the unsaved.
The problem is how do you counter the pop culture, media and schools. Conservatism is a belief based on reason and restraint. Liberalism is a belief based on emotion and no restraint. We can try to segregate ourselves from the outside influences of the overall culture, but then we become an oddity like the Amish.