While I agree that Ts should be able to keep their politics out of the room, and I don't think it matters unless it matter to you, it matters to me a great deal. Not the politics part, but the underlying beliefs part. I need to work with someone who shares certain general, broad-based beliefs about humanity, the nature of humans, and our roles and responsibilities as members of the community. If I knew my T voted a certain way in last election, I could not work with him (that is not to say he would need to vote as I did, but if he had voted for one particular candidate, that would have been the end of our therapeutic alliance).

I asked my T early on about his spiritual and political beliefs and we have open conversations about such things, because I have to feel like I "know" him on some level in order to do the deep and intense kind of work we are doing (I have worked with other Ts where we did not discuss such things, but it was different work).

In short, I think it matters if and only if it matters to you.