>>>We understand why Trump one - it's because the American voter is stupid - as evident by the fact Trump is sitting in the white house.
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>This charming circular argument does not explain why Trump won, or how the Democrats might ever win again.

Of course it explains why Trump one - because American voter is stupid...duh! As for how someone that's not a dumb as of a pick as Trump can win in the future (no matter if it's a non-dumb Dem or non-dum Rep) - the only solution is something called "education". With Trump's pick for the sec of Education don't expect this to change anytime soon.