I know its probably been discussed, but how do you vote multiple times using Firefox?
They keep track using cookies, so if you delete your cookies you can vote again. You also have to accept the cookie in order to vote.
The best way I found to do it was to set firefox to delete cookies when you close it. I then set the vote page as my homepage. Then just vote, close the window, open firefox, vote again, repeat.
To have firefox delete cookies go to Tools > Options > Privacy. Then under cookies have it keep them "until I close firefox." You may have to delete your existing cookies as well. To do that click the "Show Cookies" button that is right there and "Delete all cookies."