I don't have much to say on Horgan but I have usually voted NDP for BC elections so I voted for him in the past.
Regarding Star Trek I imagine there's some correlation for liberal views and Star Trek but it probably comes down to how you watch it. I recall seeing either a meme format or article about Dax's (Deep Space 9 episode for those unfamiliar) female kiss and apparently they got a lot of people calling in with hate for it. The other part was the people who wrote in tended to show support for the scene. So it seems like it comes down to how you view what you watch. I'm not sure what impact the series has on me exactly but I do know I like how the TNG makes their ideals look and I watched it every Friday(think that was the day) that I could when it was new.
That's why I ask if they want the full in depth explanation or the short one. Well it happened once during Dune so far, she asked for the full one. I can't even recall the question but she thought it made more sense after at least, maybe to do with blade fighting and shields, they really hammer it in the novels. Though to be fair any Dune explanation sounds better from the books than either movie, okay I haven't seen the last half of Lynch's Dune in decades but the first half didn't explain things well so I don't expect the last half to be better from my fuzzy memory.
Dune may be a bit of a special case compared to the franchises listed too.