Web video and social networks are two of the hottest technologies for Campaign '08. Video is ready for prime time, social networking is a relative unknown. Video arrived in 2006, when George Allen, then a Republican Virginia senator, called a rival staffer the crypto-racist slur "macaca." The clip of the incident helped tip the Senate to the Democrats. The Web can be liberating. "It's about bypassing the sieve of the mainstream media," says Elizabeth Edwards, wife and confidant of Democratic presidential hopeful John Edwards. "The idea that you have people standing between you and the voter is diminished, and the...