Race, religion and especially age
This election graphic from the Public Religion Research Institute is amazing. It breaks the population down by age, and then segments each age cohort by religious affiliation and race. Then it juxtaposes Obama's religious coalition of voters with the 18-29 group and Romney's with the 65+ folks. Here's what it looks like:
There's no question that GOP leaders are thinking real seriously about numbers like these right now. Which is a reason to be hopeful about, among other things, immigration reform—which a whole lot of evangelical leaders support.