it's really late, hard to think lol.
When you make a competitive poll.
example: favorite color: red, blue, green. As choices ok.
Someone could go out of their way as to see the results then vote for it then ask others to vote for it. dont get me wrong or anything sure u ask people. but if people see if its a close stretch between another option then they will do this. They should forfeit their rite to vote.
This would be more on a poll that would be giving to the public, etc donation. Like i said i'm tired. atm and going to bed lol...
hopefully this helped a little.