Look at the polls over the past 30 years. Twice as many voters identify themselves as conservatives as liberals.
You can say I'm wrong, but the empirical evidence backs me up. Heck, someone cited it on this very thread.
I AM looking at poll data. I'm gonna make a flying guess at where you're getting that number. Identifying yourself as "Christian" is not the same as identifying yourself as "conservative". Those numbers are further broken down by denomination into "conservative" and "liberal". Thus you can have an overwhelming majority of Evangelical Protestants who identify themselves as conservative but you can have an overwhelming majority of Democrat say.... Catholics.