About half, it was 54% in 2021. The problem with an assault weapons ban is it will do almost nothing to gun violence. More people are murdered with hammers every year then with ar15s. The vast majority of US gun violence is performed with regular pistols.

https://www.pewresearch.org/short-reads/2023/04/26/what-the-data-says-about-gun-deaths-in-the-u-s/

If they actually cared about the problem instead of just publicity, then they would look at banning pistols of all magazine capacities instead of rifles. If they wanted to do something acceptable for both sides of the aisle that could eliminate up to 40% of gun violence, they would prohibit people with domestic abuse charges from owning firearms. (See The Problem with Jon Stewart).

Or they could address the core problems facing people at the bottom of the economic scale, like hunger and mental health amd healthcare, the problems that make them desperate and emotional. Banning guns to prevent murder is akin to banning alcohol to prevent drunk driving. It works, but it hinders the majority of law abiding citizens all because a small percent of people misuse it.

The sad truth is they dgaf. So they do publicity shit like this that doesn’t matter.