O'Rourke is out of the running now, but since you brought him up:
https://www.politico.com/magazine/story/2019/10/15/beto-orourke-gun-debate-229849
From the article: "O’Rourke is now calling for a mandatory buyback for assault weapons and a voluntary buyback for handguns. The funding for the buybacks, he says, would come from increasing the excise tax on gun manufacturers and increasing fines on traffickers. People who do not sell back their assault weapons would be fined."
This, from the 2020 Democratic candidate that was considered the most rabidly anti-gun of the bunch. "Mandatory" assault weapon-only buy-backs that, in the end, you can just pay a fine to avoid. Hardly SWAT team members kicking down your doors to snatch all your guns away from you in the dead of night.
Personally, I don't think assault weapons are valid tools of self-defense and there certainly isn't any Supreme Court precedent saying that they are. So at this stage of our constitutional history, I believe such weapons can constitutionally be banned while still complying with 2A. Unlike handguns, which the D.C. v. Heller SCOTUS decision in 2008 protects.
I don't live in CA or VA and I don't have an opinion on whatever's happening there.