James Political Hack Carville said on MSDNC that Bernie's strategy cannot win.

JAMES CARVILLE: First of all, I -- I won't mention names so I don't get any number of calls from panicked congressional incumbents. I know what's happening out there, I got a real good idea. The entire theory that by expanding the electorate is a -- increasing turnout so you can win an election is similar to a climate denial. When people say that, they're as stupid to a political scientist as a climate denier is to an atmospheric scientist. If you want to vote for Bernie Sanders because you feel good about his program, you don't like the banks on Wall Street or you don't like pharmaceuticals, that's legitimate, I understand that. If you're voting for him because you think he'll win the election, politically, you're a fool. And that's just a fact. It's no denying it, there's so much political science, so much research on this that it is not even a debatable question.

Who am I to doubt Carville?

So I did a quick search and found this.

What research was Carville referring to exactly?

You want to know who won by expanding the electorate? FDR.

You want to know who shrank the electorate? Clinton.

The difference is that under FDR's expanded electorate the Dems controlled Congress for nearly 50 years, while Clinton lost Congress.

So can Bernie succeed in expanding the electorate?

Check out young voters in 2018 and their overall impact.