While Moveon.org is a 501(c)4, that does not necessarily mean it is a "dark money" organization. The main reasons are:
1 - it is very well-known organization
2 - it took me a matter of minutes to find a list of 4,200 donors (and their affiliation/job) that donated over $200.00 in 2016 (and I can go back many years)
3 - one their efforts is to actually end "dark money"
Good luck finding the the top donors to the Government Transparency Fund, The Donors Trust, or the Spur Education Fund.
You have pointed out two left-leaning non-profits, but this is not so much about Right vs. Left. My previously provided example in South Dakota hopefully makes that clear.
South Dakota is a Republican stronghold. On election day, and on the same ballot, South Dakotans voted for President Trump and for a measure that would reign in corruption in their state. This was despite an influx of cash primarily from fossil fuel interests that pushed against the measure.
After the measure passed, the Republican legislature (under the thumb of dark money) looked Republican and Democrat voters in they eye and said no. They did this by declaring a state of emergency that allowed them to say no and that prevented a veto re-vote.
I guess one could say that Dark Money is a matter of perspective - some people want a corrupt government and some don't.
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