"Electable" - we are the ones who decide who is "electable" - anybody on a ballot can win if enough folks vote for 'em ..
Personally, i don't think we had "something similar" with Trump and Sanders - Trump. it seems to me, was all about Trump, saying and doing whatever he thought he needed to to be, as he himself said, "the most powerful man in the world". And Sanders - hmm, made the mistake of wedding himself to the DP, and backed it, at the cost of his own stated principles, even after it shafted him over and over ...