just saw this in my Gmail spam folder. It is an RNC fundraising email for Trump declared by Google as spam.
Here is the email, and the header. Looks to me like it is a legit mailing source with sufficient compliance for not getting caught by SPAM filters. In the footer it identifies RNC as the source and has an opt-out link as well.
Possibly it is another fuckery by the big G actively intercepting conservative messaging on their network.