I just don't understand how anyone can think gun control is a "third rail" issue anymore. 1994 is long past, Democrats are in firm control of both houses, they have a confirmed gun banner in the White House.
Based on the drubbing they gave to the GOP, I believe they are convinced that they will remain in power for a very long stretch.
They are drunk already on the power they anticipate having once The One is inaugurated.
They know that voters have a short memory. Anything done far enough in advance of the next elections will be forgotten.
In other words, the Democrats are in firm control of the government, and they know it. In my opinion, they believe they can pass any damn legislation they want without penalty or repercussion.