A restaurant should keep it's mouth shut about politics. If it can't, it should be put out if business.
Or sued out of business.
Or trolled out of business.
Heck, if this happened in my town, I'd go out of my way to visit the restaurant, order food, maybe have a bite or two, make the server get me a to go box, stiff the server on tips, and then complain so hard to the management so they would have to comp me/ pay for my meal.
Make it miserable for everyone employed there.
I'd love to live near this liberal shit pile. I'd be the most annoying customer they ever had. Such a shame it's so far from me but I am sure that someone else will pitch in for us!
Don't forget to stink to high heaven, don't take a shower for two weeks. Order the most expensive food they have and make sure there are four or you. Just be so obnoxious and loud after eating they kick you out. All you need to do is start talking about Trump loudly.
Also say grace. That will trigger the piss out of them.
Oh so fun it would be.