The final nail was the fact that in 1860 the Demons split their party into three factions and ran three candidates allowing Lincoln to win with a plurality of the popular vote.
Since the election of Clinton, I realized that a system in which no one wins greater than 50% of the election will leave no clear mandate.
Since the election of Clinton, I have believed we need a national runoff election to make sure no plurality candidate forms a government which will be resented by too many people.
It isn't really consent of the governed when you have less than 50%. It's triumph of the bungled process.