When I graduated college 50 years ago next year, a constitutional amendment to replace the electoral system with direct, popular vote nearly passed. President Richard Nixon supported it. So did the Chamber of Commerce and the League of Women Voters among many other groups. It was blocked in 1970 by a filibuster led by southern senators.
They had a lot to lose if black people in the south could cast votes for president that mattered. These votes could be joined with votes of those everywhere in the country who sympathized with the civil rights claims of black people. The white advantage in presidential selection could be lost. As everyone knows, that same grip on power was transferred from the Democratic Party to the Republican Party. The irony is that the Democrats in the south would have been better off with the popular vote method of choosing the president.