It happened 27 years ago and 12,000 miles away. Does it matter now? In the heat of the Massachusetts Senate campaign, a new account has raised questions about what happened on a river bank in the Ca Mau peninsula on Feb. 28, 1969. That was the day that Sen. John Kerry won the Silver Star, the nation's third-highest award for bravery, for, among other things, killing an enemy soldier. The events of that day, and their lengthy aftermath, are what this column is about. In a conversation with me Monday, however, Tom Bellodeau, the rear gunner of John Kerry's boat...