I've done both cookies and
IPs in the past. Users coming in from dial-ups can always reconnect, delete the cookies and vote again, but that is such a pain in the 455 that I can't see someone doing it over and over and over. Even permanent IP users could spoof the address and do the same process, but that's even a worse case of nothing-better-to-do-with-ones-life.
# Trust no1!
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