This thing is exploitable (i know, I know, cookie based, big suprise, but but but ;D).
I managed to vote for George as many times as I wanted.
Here is how the exploit works, after I'm presented with the vote menu, and I vote, I click the dreaded browser back button, and I vote again.
If I close the window, and come back to the poll, I will not be presented with the option to vote.
There in lies your logic flaw. You should also check for the cookie if someone tries to vote, not just when presenting the vote menu.
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