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FTC chair alleges partisan filtering by Gmail; Google says spam filters not ideological
(www.reuters.com)
This is a most excellent place for technology news and articles.
I think it's quite likely that Republicans have worse mail list management. I somehow started getting Donald Trump emails and I never signed up for them.
I used to sign up friends to publish clearing house newsletters. Maybe someone did something similar.
Also, this is one reason I append the source to any address I willfully submit. Allows me to see who's selling my user.