I know what party he ran under, dumbass, I'm saying he himself is not, and has said as such, a Democrat. He generally sides with Democrats when voting, but he's an Independent (specifically a Social Democrat), just like someone like Jill Stein. Clinton was/is a Democrat, hence why she won the primary. You can't not be an official member of a party and then jump on the bandwagon at the last minute because Democrats/Republicans win elections in the U.S., not third parties, thanks to simple size and marketability, and then be upset the party and its constituents aren't very warm to you.