America's definition of conservative and the world's definition are different, as is the word liberal. America is progressive liberal, with conservatives and liberals being two different sides of the same. However, a conservative and liberal in, let's say, England, are completely different altogether.
(Englishmen, I only have a basic grasp on your governmental system. If I'm wrong, please don't kill me.)
Anyway, conservatism in America. You will see a trend with that. On the coasts and big cities, such as Chicago, the people are predominately liberal. Towards the interior, you find more conservatives. Since the big cities of a state are the most populous, they decide who gets the electoral votes in a presidental election. Take New York for example. The countryside of New York state is conservative, but you wouldn't think that looking at the polls, because New York City is liberal, and NYC is so big it can easily override the rest of the state.
I am a conservative. I live in one of the most conservative states in America, Texas (minus Austin, that doesn't count). Unless you go to Austin, Houston, or Dallas, and maybe San Antonio (maybe), you won't see that many Obama bumperstickers or signs.
Is America mostly conservative, though? I don't think so. The closer you get to a liberal's wrong definition of social and economic justice (you'll find the right definition in the Bible), the farther you get from conservative progressive liberalism and go into democratic socialism. So, even if the American are conservative, if the people in D.C. are liberal or socialists, that is what will be reflected.
Also, I'll tell you a story. There was this class of 1st graders. They were playing a presidential election. One kid stood up and promised lower taxes, a better economy, reduced debt, better foreign relations. Another kid stood up and said that everyone would get ice cream. Now, there was absolutely no proof that the kid would be able to provide ice cream to the entire class. However, every single child in that class voted for the ice cream kid. I'll tell you. Americans like ice cream.