A national popular vote would provide candidates an incentive to advertise in local TV markets nationwide.
Few Votes Mattered in 2012
If we selected the president based upon the winner of the most votes nationally, no voter would be ignored and every vote would matter.
Why Were Most Voters Left Out of the 2012 and 2016 Presidential Elections?
Only in the 21st century did densification and polarization produce a situation in which each of the two major parties' candidates chose not to compete in a large number of states conceded to the rival.