That looks like an excellent idea and very well executed. I really liked that it literally only took 1 click to vote (as opposed to usual where you have to click the radio input, and then click a submit button).

I have two suggestions for it:

1. Make it an embeddable javascript widget instead of an iframe. I think it would be more universally acceptable, and anyone could then simply use CSS to stylize the poll however they please.

2. I don't know if you do this already or not, but maybe track IP addresses of those who vote and geocode them onto a map or something. Comments usually have names to go along with them, it would be nice to have some sort of vague automatic identification to go along with the votes.