This article concretely lays out an argument that has been rolling around in my head for some time now.
There are two factions in the Republican Party: those that want to cut spending and bring government under control, and those that just want to ride the anti-Democrat fervor to put Republicans back into power so that they can milk the out-of-control government for their own interests. Representatives Paul Ryan and Ron Paul are clear examples of the “ideas” faction. Mitt Romney and Scott Brown are probably the most obvious examples of the “power” faction. I haven’t quite decided yet where Sarah Palin fits, but I don’t trust her.
So before you cast a vote for a Republican in 2010 or 2012, make sure you can be certain you really know what you’re getting. Or, as an safer alternative, there’s the Libertarian Party. There are certainly competing factions among the Libertarians, but all of them favor limited government. I would rather contribute to the rise of the Libertarian Party than contribute to the election of a leader who may turn out to be the exact opposite of what I was voting for.