That would have been a good idea:

You know what would have been a great way for one of the candidates to counteract the Gore endorsement? Call a press conference, keep the reason a secret, and then invite a "regular person" up onto stage to endorse you. Get a steelworker, or a soccer mom, to say, "I'm voting for John Edwards. I may not be a big, famous politician like Al Gore, but last time I checked my vote counts just as much as his does. Here's why I like John so much." It would be cheesy-populist endearing (just like Edwards!), and it would make a pretty powerful point about this thing not quite being over just yet.