There is a good reason: the President governs 50 states, not just two... therefore, all 50 should have a say...
Wrong, tbh... in a popular vote system, all a candidate would really need to do to become president is win a clear majority of the vote in Texas, Florida, New York, and California, and barely eke out a respectable percentage everywhere else....
Pandering is way too prevalent now, but just imagine how bad it could get if the candidates literally only had to campaign in a select few large population centers that run the gamut of political opinions... everybody would be forced into the middle, and we would officially have no real choice anymore, tbh....