Why do we need runoff elections?

Since the Presidential election of 2000, more than a handful of Federal elections in the fifty States have ended with the difference in vote totals between the winner and the loser falling into the margin of error. In 2000, it is possible if not likely that this resulted in the election of a different candidate for President that the one who would have won if the election had been perfect. This year, several senate races are within the margin of error. This opens the door to bias and fraud on the part of partisan election officials, judges and others who will end up determining who wins these elections. There is a better solution, which is to hold runoff elections when the difference is within the margin of error.