The normally press-shy Bruce Springsteen is going public tonight with a one-on-one interview with ABC's Ted Koppel. Springsteen is appearing on "Nightline" to talk about the intersection of pop culture and politics, as well as a long-rumored concert tour starring him and a lineup of other politically outspoken acts such as REM and Pearl Jam. The Los Angeles Times reported last month that the tour would hit swing states around the country this fall, with the goal of unifying fans to vote against President Bush in November. Springsteen rarely does interviews, print or television, so nabbing him for tonight's "Nightline"...