Ummm...Keyes for President?

Okay, so I'm going over my sample ballot getting ready for tomorrow's election (go Obama!), and apparently the presidential race is not just between Obama and McCain, but also between Barr, McKinney, Keyes, and Nader... Hmmm, I am dumbfounded. Who are these people? Are their names there because two candidates didn't take up enough space on the ballot? Or do they really believe they might sweep the election? I do realize I stay away from the nightly news, but good lord, six candidates? And who knew we had a Peace and Freedom party? Not me.