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I don't think that is obviously true. Stein and the Green Party finished behind the Libertarian Party by a signification margin.

What states would have switched? In Wisconsin Clinton + Stein did outpoll Trump alone (by ~10K votes), but the Libertarian party had another 106K votes that would have been allocated and it's not hard to imagine Trump getting more than Clinton of them.

It was a similar story in Pennsylvania and Michigan.