How long is the confirmation code? Is it multiline? Did it work when pasting the link from the email?
It was one line. Copy-Paste did not work either.
Can you send me the link in private?
Does anybody else have any problem with getting his vote confirmed?
Edit: I asked about it, and you get the same error message if you use the link twice, maybe your browser opened twice with link, first time to confirm and second time you got this error. I think your voted counted.
(And if not, this case 'tricked' a SF staff to vote for us, so that balences out nicely)