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Re:Ruth Bader Ginsburg has died by nostromo on Friday September 18, 2020 @09:13PM (#24523851)
In this case I don't see why it needs to be an adjective.

By analogy, you'll more often hear "Texas senator Mr Bean" (using the singular noun) vs "Texan senator Mr Bean" (using the adjective).

In any case, it's not something anyone should get worked up over.

Re:Ruth Bader Ginsburg has died by evan_ on Friday September 18, 2020 @10:37PM (#24524417)
Let's ask Google.

  "democratic senators"
  > About 969,000 results (0.52 seconds)

  "democrat senators"
  > About 92,800 results (0.42 seconds)
Bonus:

  "democratic senators" site:breitbart.com
  > About 1,010 results (0.32 seconds)

  "democrat senators" site:breitbart.com
  > About 2,300 results (0.27 seconds)
Conclusion: "democratic" is significantly more common outside of right-wing propaganda.
Re:Ruth Bader Ginsburg has died by jumelles on Friday September 18, 2020 @09:21PM (#24523910)
Re:Ruth Bader Ginsburg has died by nostromo on Friday September 18, 2020 @09:28PM (#24523964)
I'm well aware... but in this particular sentence he or she is talking about specific Democrat, not the Democratic Party, and as such, seems grammatical.