To use Al Gore as a term, it's mainly to indicate that someone who thinks they're going to win or have a chance doesn't actually. Just like Al Gore in the Presidential Election Race, he thought he had a chance but in reality, George W. Bush was never going to lose.
Katich: "Yeah what an Al Gore that was".
Langer: "South Africa are more like a John Kerry, than Al Gore, bloody chokers".
It's exactly like saying Bush attacked Iraq, he didn't actually do it, but he was the main government figure that made it happen.