I think Shatner is a Canadian-but I don’t think he is a total liberal. Some of the people on that list are from other countries-Aussies and Brits in particular-others are the kids of liberal actors and such-like the Roddenberry kid, the Nimoy kids, Chris Pine who is the new Capt Kirk is the son of a lib TV character actor-so are several others-etc...
I’m a Star Trek fan-but it has always been produced by liberal loons starting with Roddenberry-these people should just shut up and act, direct-whatever it is that they do for a living-they are delusional if they think anyone but a lunatic fringe pay attention to their politics...
Shatner has dual citizenship. He became a naturalized US citizen in 2004.