The fact that it was one user was identified by the fact that all of those votes had the same IP address as well as the same cookie and it happened at a relatively short span of time. If it was one IP address and several different cookies then cool_dude's theory could have been correct. But all the votes coming from the same COOKIE points to the fact that they all came from one computer. It is not verylikely that 58 people used the same computer to vote for the same answer within a span of 15 minutes.