Yeah, maybe. I haven't looked it up, but I suspect that while a majority of Americans support tighter gun control, it's not an overwhelming majority. And probably heavily weighted toward Democrats, with a majority of Republicans being more in favor of guns. Independents probably favor control, but aren't going to be significantly involved in party nominations. So Republicans will continue to nominate gun advocates and thanks to the constitution and gerrymandering, control most states and have disproportionate influence in the US Senate.