No, radical policies won't drive election-winning turnout

[thesquanderer]

7. It's an interesting perspective, that a Sanders candidacy could increase turnout for Trump...

...but I don't think so. Yes, I understand his point that, in many races, a Dem candidate who was perceived as highly ideological increased turnout for the opposition even more than what they increased for their side... but I think you have to assume that the opposition was a somewhat normal, maybe even mainstream candidate. If the opposition is Donald Trump? No, I don't think a Sanders nomination will bring out more Trump voters than a Biden or Bloomberg candidacy would. Or to look at this from another angle, Trump voters generally don't hate Sanders the way they hated Hillary, which is an argument for Trump perhaps seeing weaker turnout with Sanders as an opponent than he had when Hillary was his opponent.

I think you have to look at the particular candidates in the contest, rather than just saying progressive Dems tend to increase Republican turnout, even if the latter does often happen.