Furthermore, any politician who claims to be for limiting the power of government and yet who nonetheless votes for any measure that puts us on the road to war -- e.g. sanctions -- is objectively pushing us in the other direction. This is why Ron Paul, for example, has never voted in favor of economic sanctions, and has never compromised one iota when it comes to foreign policy issues.
In judging which political candidates to support, and (more importantly) the question of whom to oppose, the rule should be: judge harshly. That may sound unreasonable, and even a bit dogmatic, but the reality is that the only way to get the kind of behavior we want in politicians, when it comes to the vital issue of war and peace, is to punish them for warmongering and support them when they work for peace. Otherwise, they can and will literally get away with murder.