In an earlier diary "swing" and "margin" voters were discussed.
In Dispatches from the Culture Wars: How the Left Lost Teen Spirit by Danny Goldberg (which I finished last night and recommend) the author hammers on the point that Clinton had a 19 point margin over Bush in 1992 among 18-25 year olds and that Gore merely broke even among this demographic group in 2000. Goldberg's thesis is that the Democratic Party is led by cultural snobs that by design or neglect alienate younger voters by neglecting their issues and disrespecting their culture.
I would like to see MoveOn.org or some other group make an effort to register enough new voters so that turnout can be elevated by one percent over what it would have been otherwise. My preference is to have Bush critics and skeptics work to register all, but especially people that are traditionally registered at low rates, young adults, especially enlisted service members. Of course there has to be a systematic way to encourage individuals to vote too.
Both the Corzine win in New Jersey and Mark Warner's win in Virginia relied heavily on sophisticated efforts to register and get to the polls voters.