Perhaps you could explain the difference, because I don't see it.
"Democratic Socialism" the best I understand it seeks to further Democracy by putting the power back into the social class, not the oligarchy as the US (in my eyes) become. I think it's putting the "we the people" back into power. Look at Bernie's top-priority messages. Get rid of Citizens United (money in elections) and get rid of big banks. If those two things are accomplished, "we the people" would have more power and held less at-hostage by the oligarchies at power... But just my thought. This video does a decent job: https://www.facebook.com/DemocraticSocialist/videos/57540356...
Well the Soviets would have considered themselves Democratic Socialists. It's not like anyone ever advertises themselves as undemocratic in an official way like that.
I really think Bernie is best penned down as a "social democrat". I don't understand why he calls himself a socialist?
I'd recommend you actually read about the differences; one of them still has Capitalism, the other doesn't. It's a massive difference.