There is a subtle difference between a mule and a Democrat regarding heirs: The mule is biologically incapable of producing heirs, the Democrat systematically kills their heirs.
The thing I think everyone overlooks is how your views may change as you get older. I know mine have definitely gotten more to the right as I got older. When I first voted at 18, I could have voted for a Democrat. Now at 50, I now find it extremely hard to vote for a Democrat because their values definitely are at odds with mine. So you've got to figure that the percentages of the <30 crowd are going to change as they get older.