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Preventing multiple daily votes in a contest

Voting contests seem to get a lot of attention from people who want to play the system for fun. I know that I spend a lot of time cheating on my forms and URLs, deleting cookies, and writing random crappy scripts.

Is there a way to create a reliable voting system that allows only one vote per day? Is Captcha the only effective way to restrain automatic voting? How did you decide to solve this problem? Some of my thoughts on solutions are about IP addresses or require email, but even they seem so easy to get around.

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A: Associate each voice with ip. Proxy-based automatic voting is non-trivial. However, getting 10-20 votes per day is easy. And obtaining 1000 independent IP addresses for voting is more difficult (although this is possible through commercial anonymizer services).

B: use ReCaptcha.

C: Do not show current results. People should not easily determine if their voice has done anything.

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Creating a fair defense system that is fair for a fun vote is likely to ruin it. My advice is simply not to provide an accurate feedback channel! If you provide feedback on the acceptance of the vote, show subtotals with duplicates so that people think that their additional votes are being counted.

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