I just started using this (most popular) polling plugin to my website.
Seems to work great and nice and flexible output layout.
[ link redacted, please do not post links in reviews ]
However, the sidebar widget in particular could use a field where you can add more detail/background to the question - or even a custom link to a post with more detail.
Also, could do with a few more chart output options. I suppose you could always take the output and manually create an infographic later adding that to a post....