I have all the answers for you:
1. Wrong forum to post on.
2. You can use a proxy to keep changing your ip address and vote.
3. Although no.2 doesn't work anymore as the voting system also disallows multiple voting on a single account(This is for a common voting website, I might be wrong as I am only referring one website, not multiple websites).
4. Therefore, nothing can work with the exception of unique websites that allow multiple voting on a account. But the chances are slim because servers would definitely change the voting website.