Politicians need to be careful about invoking large principles to get themselves out of political jams. The principle they thump the tub with today might be the one they want to run from tomorrow. In for a little, in for a lot as the old saying goes.
Ideologues are especially prone to this temptation, since they fancy that every thought in their noggins and every utterance from their lips comes from on high. The invasion of Iraq has been a case in point, in particular the current mess regarding Karl Rove and his Tricky Dickery. The Right has tried to extricate itself by, among other things, harkening to high principles of national security and prudence. In the process they have backed themselves into agreement with advocates of action on global warming and other environmental threats. They just don’t seem to realize it yet.