If the US presidential elections had runoff

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Nice that you remembered. A runoff 3 or 4 weeks after the first round is another election. Enough time for new scandals. In countries in which there is runoff, one candidate usually doesn't keep in the runoff 100% of the vote he had in the first round. It's usually something like 95%. I ignored this only in order to make simpler.

IIRC, the Democratic senatorial candidate for Georgia almost won a majority in 1992, but nevertheless failed in the runoff to win.