These bills would make the state a party to a compact among states that pledge their electoral votes would go to the winner of the national popular vote, which would go into effect whenever states with enough electoral votes ratified the measure, regardless of how the vote turned out in their respective states. This would create an end run around the U.S. Constitution, as Art. II Sec. 1, modified by the 12th and 23rd Amendments, sets up the procedure where, as known today, the Electoral College selects (except in cases of lack of majority vote) the president and vice president.
Proponents of the idea argue that the present system of people voting for other people who vote officially for these officers confuses the electorate, subverts the will the majority in the historically rare instances (two) where the national popular vote winner does not win a majority in the College, and leads to candidates concentrating campaigning on only a handful of states of assumed competitive states. Opponents who support the current system argue neglect of many states, especially rural ones, would increase even more as candidates would concentrate their efforts of urban areas and the largest states where the biggest vote hauls exist.