The United States presidential election uses a controversial winner-takes-all system where votes from individuals are batched together in each state to be counted as one voice, via an electoral college. This makes it possible for one candidate to win while more individual votes were cast for another.

This has happened a handful of times already, including in 2016 and 2000. See Wikipedia for a full list: https://en.m.wikipedia.org/wiki/List_of_United_States_presidential_elections_in_which_the_winner_lost_the_popular_vote

This market will resolve to YES if the next elected president won the popular vote, otherwise it will resolve to NO.