The most important inquiry conservatives must posit in every policy debate: "What does our Constitution authorize and mandate?"
Liberals can't even understand that question (and to be fair most elected GOP only know enough to give lip service to the idea) . They all think the Constitution is old and irrelevant and won't even agree it should be followed - after all it was written by dead, racist, slave owning, white men, and it can therefore be disregarded.
The only way a liberal understands something is when it is couched in terms that affect him.
Ultimately it comes down to hitting them over and over and over again with Thomas Sowell's questions for destroying any liberal argument
1) At what Cost? (e.g. You want to spend $15 Trillion on an "insurance policy" against global warming?")
2) Compared to what? (Woman are oppressed in the U.S.? What happens to them in the Muslim world)
3) Do you have any hard evidence of that? ( So, what research or facts lead you to that conclusion? You heard it on the Daily Show? And Al Gore said it? I see. Those aren't really facts so much as hearsay, huh? What arguments did those guys make? None? Hmmm. So what are the opposing arguments? Never heard them huh? Doesn't being a free thinker require you to hear both sides and THEN make up your mind? )
4) Who is to decide? (Do you really want a man like GWB ( or Perry) in charge of your health care? No? Then why did you vote to give them that power? )