It's benefit EVERYONE the most. (Except of course those on the political gravy train)
You don't understand how it would benefit people. You seem to think there'd still be a two party system in place, that everything would be the same except Democrats getting more votes.
It wouldn't.
People would have more choice, and they'd use that choice.
Look, Germany vote TWICE on the same day, at the same time.
Once using FPTP and once using PR.
Look at the 2017 German federal election.
en.wikipedia.org
The CDU/CSU (one party, the CSU stand in Bavaria and the CDU don't, when I was in Bavaria I saw Merkel who was at the CSU annual conference) got 37.27% of the FPTP vote. That gave them 77% of the seats.
With PR they got 32.93%.
They lost nearly 5% of the vote. Same people voting, same day, same policies.
What's the difference? The system.
With FPTP they know it's a choice between the CDU/CSU or someone else and they vote tactically. With PR they can vote for someone else.
The FDP is a center right party. With FPTP they got 7% and with PR they got 10.75%
They gained 3.75% of the vote, just because the system means people who wanted to vote for them, felt they could, without risking anything, whereas with FPTP they felt the need to mostly vote for CDU/CSU.
It's also interesting to see Nord Rhine-Westphalia.
This Land (or state) makes up 21% of Germany. That's bigger than any US state. California is 11.8% of the US's population. Nearly half the size of Nord Rhine-Westphalia. Does it control German politics? No.
32.6% voted CDU, 26% SPD (the main two parties), that's 57.6% of the vote. The other parties picked up a reasonable amount of votes.
California had more voters for Trump than any other state, the right wing would pick up votes with PR in CA, just as the left would.
I'm perfectly aware of how the US Electoral College works. You don't need to point out basic points. The point I am making is that the system should change because it's crap.
No, the system wouldn't give the Dems permanent anything. In Germany no party gets enough votes to control government. They go into government with other parties, it forces them to have sensible politics.
No, you the US is not Denmark or Germany. Change the system, and everything changes and then the US might better resemble countries that have sensible politics.
People don't know what the issues are because the Reps and Dems have no interest in pushing the issues. Why? Because they only have to defeat the other side. Nonsense prevails. Let's talk about guns and abortion rather than education, rather than infrastructure, rather than things that actually matter.
Colin Powell was asked if he would run for presidency, and he said no, he said he's say what he thought, which would alienate most voters.
It's true. You need a president who can be liked by many, which means not having views on things, it means doing what needs to be done to win the presidency, rather than actually standing for anything.
When you have parties that stand for something, people are more likely to understand because these parties are going to tell people why they think these issues are important.
More choice, more voices, more oversight. It all means people are going to get more reality, more sensible politics, everything is better.
You worry about Dems taking over, but people on the left will vote other parties, people on the right will vote other parties, people in the center will vote other parties.