Playwrite David Mamet has an interesting essay in the Village Voice documenting his political shift from left to right. Some choice outtakes:

We were riding along and listening to NPR. I felt my facial muscles tightening, and the words beginning to form in my mind: Shut the fuck up. [...]

The Constitution, written by men with some experience of actual government, assumes that the chief executive will work to be king, the Parliament will scheme to sell off the silverware, and the judiciary will consider itself Olympian and do everything it can to much improve (destroy) the work of the other two branches. So the Constitution pits them against each other, in the attempt not to achieve stasis, but rather to allow for the constant corrections necessary to prevent one branch from getting too much power for too long. [...]

I began reading not only the economics of Thomas Sowell (our greatest contemporary philosopher) but Milton Friedman, Paul Johnson, and Shelby Steele, and a host of conservative writers, and found that I agreed with them: a free-market understanding of the world meshes more perfectly with my experience than that idealistic vision I called liberalism.