Because First Past the Post electoral system mathematically always derives into a two party system we're using an voting method to elect people who only represent a small percentage of Americans. Instant runoff voting on the other hand allows 3rd parties a more realistic chance without knowing that strategically you lose your vote if you allot it to one of them. Making 3rd parties stronger will make for a better competition between all the candidates with a result of having better candidates over all.
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