That's exactly what I have been trying to do (i want to make a free service for people to support the communities/tags they like) but couldn't make the votes go through while streaming posts worked fine for the tags targetted. I could also vote on a post via permalink. You also wet went as far as putting the blacklist and a list of rpc nodes.

Awesome job. Thanks for python noobs like me. I will give it a try asap. Resteem for the occasion.