EDIT: I should clarify, by Jill Stein, I mean what her party’s official platform and policies are on paper, aka, the reason people likely fall for her honeypot (I dont think they necessarily know or believe she’s a Russian asset and vote for her on such a basis)
For starters, there are only right and extreme right policies among the Dems and Reps. Secondly, there is a massive pool of disaffected voters that would vote for a lukewarm progressive like Bernie, who was projected to even steal Trump voters, because progressive policy is popular. The Dems ran rightward and lost their voters in general.