I went to the dictionary to paste in the definition of principle, and lo and behold, guess what I found?
The collectivity of moral or ethical standards or judgments: a decision based on principle rather than expediency.
The idea of a principle is that it is not compromised. In fact, it's the baseline by which you are supposed to make other judgements...the standard if you will.
Now, I happen to think CFR is unconstitutional (those are my principles). BUT, you can find 10 constitutional lawyers who will tell you it isn't. Bottom line: in a Democratic Republic, principles are what the people say they are, through a process of both voting and the courts. Therefore, federal $ to education is completely constitutional, not because I want it to be so, but because neither the representatives nor the judges have deemed it otherwise. This is a reality you need to grasp, and when you do so, it will make politics much easier to deal with. My job is to get as many people as possible to agree with my principles, but I'm not dumb enough to think that because they don't, they don't "have any principles."