Now here's the sort of evolution we can get behind. From the San Francisco Chronicle
Over the past three decades, conservatives have been procreating more than liberals -- continuing to seed the future with their genes by filling bassinets coast to coast with tiny Future Republicans of America.
Take a randomly selected sample of 100 liberal adults and 100 conservative adults. According to an analysis of the 2004 General Social Survey -- a bible of data for social scientists -- the liberals would have had 147 kids, while the conservatives would have had 208. That's a fertility gap of 41 percent. Even adjusting for other variables like age and income, there is a gap of 19 percent.
So what does it mean that the birth rate in Salt Lake City far outstrips that of liberal San Francisco (where dogs supposedly outnumber children)?
"Liberals have got a big 'baby problem,' and it risks being the death of them," contends Arthur Brooks, professor at Syracuse University's Maxwell School of Public Affairs. He reckons that unless something gives, Democratic politicians in the future may not have many babies to kiss.
"When secular-minded Americans decide to have few, or no, children, they unwittingly give a strong evolutionary advantage to the other side of the culture divide," writes Phillip Longman, senior fellow at the New America Foundation. "If 'Metros' don't start having more children, America's future is 'Retro.' "