The reason Democrats hate the Electoral College is that the Electoral College gives too much power to small population states, which sometimes vote in such a way as to prevent winners of the national popular vote in presidential contests from being elected.
Nevermind that that's how the founders intended it, in order to keep minorities from being dictated to by majorities. It is suitably hypocritical of the Democrats to want to oppress minorities, seeing how they have taken minorities for granted for decades, always promising them the moon but never delivering them so much as a sandwich let alone a sub so fast they'll freak.
TheHill.com has a story
here on the subject of the Electoral College, referencing the National Popular Vote (NPV) campaign which proposes to make an end-run around the Electoral College provision of the constitution. You know, kind of like seceding from the Union was an end run, because that's what the NPV amounts to. The normal process of amending election procedures involves a constitutional amendment, but the Democrats have hatched a plan, the NPV, which amounts to an affront and challenge to the existing system, agreed to only amongst the states participating without benefit of legitimacy conferred by constitutional amendment. The legitimacy consists entirely in the agreement of the states. As such the NPV represents an insurrection against the rest of the states who do not participate.
Mostly Democrats favor doing away with the Electoral College, which is in keeping with what animates the Democrats, namely democracy, especially direct democracy. Despite all its problems and blemishes, it is the Republican Party which stands for constitutional arrangements as they exist, notably Sen. Mitch McConnell of the US Senate, the Republican minority leader in the Senate. His support for the Electoral College covers a multitude of sins, and I do mean a multitude.
The Republicans would sound more convincing in their support for the Electoral College, however, if they were to support also repeal of Amendment 17, ratified in 1913.
The reason is that it would show that the Republicans are serious about constitutional principles of representation.
The original constitution envisaged bodies of electors who were different in identity in order to separate the powers of government to prevent tyranny, it is true, but also to spread representation effectively not just to the individuals who make up the nation but also to the governmental institutions which the constitution created as creatures of the people.
The electors originally were three.
The people who elected their US Representatives. These number 435 but should today number 10,267. The process of representation growing with population was halted in the 1920s. Arguably this concentration of power in fewer hands was a response to arrogation of democratic power by the Senate in 1913.
The states originally elected their US Senators, "chosen by the Legislature[s] thereof". Elected as they are now, popularly because of the 17th Amendment, they do nothing but make a redundancy of the US House of Representatives. And not just a redundancy but a trump. The Senate possesses much more power because they are not answerable to the people but every sixth year instead of every second. If anyone is responsible for gridlock in our times, it is this new imperious US Senate since 1913, not the political parties who duke it out in the House. The US Senate literally lords it over the US House as a kind of Super House. They only occasionally answer to the same people as the US House when they should be answering to, and representing, the states. The latter now possess next to no voice at the federal level except through the court system, where they must sue to be heard. A fine kettle of fish, that.
The Electoral College is now the last bastion of representation left to the states as states, and Democrats seem bent on taking it. The Electoral College is composed of persons appointed by the states in number equal to the number of Representatives and Senators, and they elect the president. The electors cast their votes now more or less everywhere based on which candidate wins the popular vote in the presidential election in each state. It is a winner take all system which blends popular sovereignty with states' rights. But the NPV would nullify this, casting the votes of the electors not for whomever wins the state, but for whomever wins the country.
As sketched above, the history of these developments is a history of lost representation. A US House member should represent 30,000 people max, but today supposedly speaks for over 700,000 on average in each district. State legislatures no longer have a voice in the halls of Congress because Senators are popularly elected just like the House. And if the Democrats get their way, smaller states will also lose their voice in electing the president because no matter what the citizens of Wyoming, New Hampshire and Montana want, the citizens of California, Florida and New York who are more numerous will dictate otherwise.
And Democrats are about nothing if not dictation.