Whether "liberals" gave us the 2nd Amendment originally is water long over the dam, down the river, and out to sea. The issue is that TODAY, the gun grabbers in Congress--people like Schumer--are LIBERALS. If you poll most people who self-identify as liberals and most people who self-identify as conservatives, you will find a significant difference in which group supports RKBA.
Journalists (in other words, the MSM) self-identify as liberals at a rate of something like 85%. Is the MSM mostly pro-gun or anti-gun?

I'm quite happy with people who identify with the liberals who gave us the 2nd amendment. Unfortunately, while today's liberals may claim to identify with our founding fathers, they have a very different idea--for the most part--on the issue of RKBA.