Conservatism has nothing to do with free markets, it's a philosophy of preserving what exists, rejecting all change. Conservatives end up tacking on a "pro free market" position because it helps them in the polls. If you take a look at the policies that a "liberal" and a "conservative" make, with regards to the economy, they're mostly the same (this is especially true with regan[1][2]).
Neither democrats nor republicans care about what the people think or how free they are, if they did, they would repel the mass of regulations that they have decided are for the peoples "well being." A bureaucrat or politician centralized in D.C. can't know what's "good" for an individual in Washington, Alaska, or any other state. No one knows better what they want and need better than them self.
[1]
http://mises.org/daily/5010
[2]
http://mises.org/daily/5011