Give them something to vote for. Other than Bernie, nobody is lighting a fire in anyone's shorts. "Disaffected Young Americans" should be forming their own political party.
Never confuse a hypothetical with an actual. We're talking about a made-up political party in a made-up situation running for made-up office. The probability fan stretches out past the horizon. When I lived in New Mexico a third of the local offices went to the Greens most of the time and that was just fine. I voted for a lot of them. But you don't ever say anything about anything but the fucking presidency and I'n'I know that the principle reason Bill Clinton was president is a guy named Ross Perot, and the principle reason George W Bush got elected is a guy named Ralph Nader. It's astonishing how often, how specifically and in what a concrete way I am forced to hector you for being a political dumbass and what filters through your know-nothing reality distortion field is "I only vote Democrat."