If I could bore your readers with a metaphorical explanation, the problem with Senator Clinton's version of change is that the way she's being going about it, and will continue to go about it, is akin to bailing a battleship with a teaspoon. And she's not even trying to plug the hole that's sinking the ship.

Senator Obama might go so far as to at least use a bucket. He might even start working on the hole.

But John Edwards version of change is more like hooking up the ships engines to the bilge pumps and turning them wide open, AND plugging the holes that are sinking the ship.