I actually do this on my site, SystemLogic.net.
What I do is grab the actual HTML from the thread with the poll on it, and post it on the site. To make more than one poll randomize, I make a seperate file with each poll HTML on it, and then a page which randomly picks one of those files, and I then include that random file onto the site.
I'm sure they may be a better way to do this, but I'm happy with it
If you're interested in me making something more detailed, let me know and if I have time I can post something up on here that has all the steps.