OP here. I appreciate the consensus. What can we do? (Other than wait 3 1/2 years for the next president.)
Here are the two things I’ve come up with:
1. This content does not belong on a .gov web site that children and schools use. That would seem to fall under a misleading domain name, and I found this:
To report obscene material sent to a child, a misleading domain name or misleading words or images on the Internet, file a report on the National Center for Missing and Exploited Children (NCMEC)'s website at www.cybertipline.com, or call 1-800-843-5678. Your report will be forwarded to a law enforcement agency for investigation.
2. Since this is political by its very nature, wouldn’t it be a violation of the Hatch Act? That seems to be something we can report here:
https://oscportal.powerappsportals.us/SignIn?ReturnUrl=%2Fhaanonymouscase%2F
Creative, politically astute people: what else?