Trump creating the Patriot Party, republicans trying to reimage themselves from him, democrats being Dems still would break the system. Enough of his base would gravitate towards him, and give an excuse for more outright racism and whatever else they can find use for it. It would be an actual 3rd party that could fuck up the system enough to allow more parties in. Left could take advantage maybe?
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That's true, but only regionally, not necessarily nationally. See the UK for example : in every seat there are two major candidates and the rest doesn't really matter, but those two parties aren't the same for every seat.