Max,
It also grows the third and fourth parties, though, right? So many people don't vote for a third party candidate because they know they can't win. People still do, but not enough to say, get on the debate stage or to get federal money (the bar for which is 5%, right?).
While in 2016 it probably would have elected Hillary, and in 2008 and 2012 Obama, it would have also allowed those on the farther left to run rigorous campaigns against them without worrying that, in the end, they'd lose to someone no one wanted.
Nothing's perfect, but our current system is pretty awful.
I agree with you on a parliamentary system, and if I were trying to reimagine this country, I'd probably replace the Senate with one that matched a national vote. It might balkanize the two big parties, I think, in really important ways, and allow for a more representational form of government than we have now.
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