It's a modified version of this https://docs.google.com/document/d/1BUUQdzu1JjnRlcs_jobXm7Qu-OmUgnYM-A-UtzCU14Q/edit

Basically:

Get Firefox and install iMacros (https://addons.mozilla.org/it/firefox/addon/imacros-for-firefox/) and Cookies Manager (https://addons.mozilla.org/en-US/firefox/addon/cookies-manager-plus/)

First, visit the poll website and click on the button at the left of the URL and block the cookies like in pic related.

Then open iMacros, edit one of the macros and click load (button on the top of the edit window, near the save button), and load this:
http://www66.zippyshare.com/v/iQtApY5Z/file.html

Now change the Max number to something high and run the loop.