Being in favor of gun control can mean a lot of things, and it's jumping the gun (intentional pun) to say it means taking away handguns and hunting weapons (fwiw, I a much happier with my neighbor owning a rifle than a handgun).
you are right that he could not by himself get your guns, or mine! but he is for gun control and or surrendering most nonhunting type of weapons I.E. handguns, assault rifles!
Listen, I hate both political parties, but the burden of proof is on anyone here who wants to say this or that politician is going to take away your guns. What's the evidence? Has he said he's in favor of banning hand guns? In most cases, politicians who say they support gun control mean they are in favor of intensive background checks for things like mental health or a criminal record, or regulating the sale of firearms at gun shows, etc.
There's also a new alignment of hunters and conservationists, e.g. ducks unlimited. It will be interesting to see how these alliances play out in the future of the democratic party.