If Sen. John F. Kerry [related, bio] had his way, he'd be lobbying foreign leaders, leaning on Congress and mapping a new Supreme Court from the White House wings. Instead, his government interaction last week was limited mostly to the arcane world of City Hall and the Beacon Hill Architectural Commission. Kerry and his wife, Teresa Heinz Kerry, won initial approval Dec. 16 - only after a lengthy debate and contingent on a rash of future paperwork - to build twin railings on the front steps of their Louisburg Square mansion. To bolster their case, the Kerrys laid out everything...