Fugitif, try to use TOR (www.torproject.org) implemented in Vidalia bundle - that will enable you to select unique nods so that you'll get more votes. Using TOR via script is possible but i have no idea how to write a script that uses only unique nods (usually it uses the same nods as 3-5 minutes before). Check it here (sorry in Russian)
http://raz0r.name/mysli/ispolzuem-tor-kak-istochnik-besplatnyx-proksi-serverov/