Whether or not it should be aligned to the side, I'm unsure given responsive and all that. Plus if someone has a poll of 10 options, and only has 1 line of text (ie. "What do you like best?") it could look a bit ugly with the long poll on the right and barely any text on the left.
So maybe it could be at the top of the first post and inside the post itself?
It would be great to include a poll in any post, anywhere in the thread.
In my community, thread participants often want to collect votes or feedback on various ideas they are discussing, and there is currently no simple way for them to do that, short of creating a new thread (which is awkward and clutters the main forums).