I clearly passed that rule solely and explicitly to piss you off, Karo. :P
...Or maybe it was because with only three ponies left, enabling folks to vote twice defeats the purpose of a "Save My" contest by effectively enabling voters to anti-vote the pony they dislike most, as opposed to enabling them to actually support the pony they like best.
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The Legend of Snake: http://tinyurl.com/3cal86z
The LoS Instruction Manual: http://tinyurl.com/3jlax8h