Michael Berg says he and Nick shared a belief in taking a principled stand. It is this belief that Mr. Berg says inspired his Green Party bid for Delaware's only Congressional seat in the wake of Nick's kidnapping and killing in Iraq two years ago. "Nick stood by what he thought was right," said Mr. Berg, a 61-year-old former teacher who is trying to unseat a seven-term Republican, Michael N. Castle. "I plan on doing the same." The videotaped beheading of Nick Berg, a 26-year-old freelance radio-tower repairman, shocked a world audience after it was broadcast on the Internet. "I'm...