It would be too easy to put together a list of the most absurd things Ron Paul has said. Libertarians have much to offer on domestic issues, but they are an absolute danger to the nation on foreign affairs!
I tend to agree with your post #50, being a libertarian. IMO if Congress says OK in any matter of speaking as well as gives funding for it, they've given their declaration as far as Constitutionality is concerned. Although also IMO, a formal declaration of war would be preferrable for the following reasons.
1)The intent is well known
2)Congressmen have to directly say yes or no, therefore giving the stated goal more authority. They can't later on come back and say something completely different.
3)Generally would be more likely to throw our entire military might behind it, unlike say Vietnam where we never completely went full force.