I doubt the part of the poll that has Sanders winning, no way Sanders is elected in a general election. Given his strong viewpoints and the fact he runs only on 1-2 issues and ignores everything else, he would not only empower the GOP voters to come out in droves but would alienate many Dem voters in swing states.
Let's be realistic here, no one wants Sanders elected except a small group of far left Dems and idealistic youths who take American Studies at private universities and then want their loans forgiven.