Absolutely unconstitutional, but the conventional wisdom at the moment is that its moot because they dont have a path to 270. Someone did an analysis a few weeks ago and said this thing is going to top out around 206.
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Do you see a problem if the governor States after the election that the EVs were awarded Dem due to popular vote even if Dems lose 2020? If precedent is set and allowed to stand, then we have a dead country walking.
I absolutely see multiple problems with this scheme, but by its own terms this “compact” doesn’t kick in unless participating states amount to 270 or more.