Wasn’t the Communist Party outlawed here in the U.S. at one time in history? I seem to remember that.
Now, the endorsement of the Communist Party is a resume enhancement.
I would have thought that might be unconstitutional but ti turns out that you are right:
Wikipedia says that a lower court did rule the law unconstitutional, but apparently it is still on the books.
The CPUSA endorsed Obama in ‘08 and again in ‘12.
They didn’t run a candidate because he was so closely aligned with their thinking. Bet they endorse the next dim candidate.