One of the most ignored and yet dangerous aspects of a “popular vote” is the fact that it can produce quite the opposite intended, and in politics a “can” oft means “it will”.
Once the two party system is minimized, and the barriers to enter any party lowered, then count on a plethora of parties arising, evolving, splitting, and developing factions.
Thus by destroying a fairly stable two-party system we could develop into a system of factions, none of which would obtain the so-called popular vote, yet one would ascend to power in a runoff.
Ruling by faction would not require local or state affiliations of party,
nor any need to recognize pressing issues within states,
thus essentially driving all campaigning strictly into national media.