If you pulled ballots to overpunch with Al Gore, you would actually punch the Pat Buchanan spot on the ballot.
The whole idea is based on the observation that there were always a lot of ballots where the Presidential selection was left blank. So, if youcan get hold of those ballots you can overpunch them on behalf of your guy. The easiest way to do this is to simply overpunch all of the ballots. This also disqualifies any of the votes for the other guys. It's kind of like giving your candidate two votes!
The Democrats got caught red-handed trying to steal the election in Palm Beach county. Although they've done nothing to earn sepukku, there's no reason to stop them from expunging their shame by other means.