Actually it was, at least by some Democrats of the Bad Olde Days.
"Certainly one of the chief guarantees of freedom under any government, no matter how popular and respected, is the right of citizens to keep and bear arms. This is not to say that firearms should not be very carefully used, and that definite safety rules of precaution should not be taught and enforced. But the right of citizens to bear arms is just one more guarantee against arbitrary government, and one more safeguard against a tyranny which now appears remote in America, but which historically has proved to be always possible."
Sen. Hubert Humphrey, Know Your Lawmakers, Guns Magazine, Page 4, Feb. 1960.
Senator Humphrey was a liberals liberal, Senate Democratic whip from 1961 to 1964, Vice President from 1965 to 1969, Democrat nominee for President 1968. (Lost by only 1% of the popular vote).
It would be a good one to use against Democrats.