In what could prove a sleeper race with national implications, some West Virginia Democrats say they are seeing signs that the state's Senate race could be turning into an unexpectedly tough and expensive battle. While popular Gov. Joe Manchin III, 63, was widely regarded by Democrats as a sure thing to fill the seat long held by Sen. Robert C. Byrd, a new Rasmussen poll released this week showed his Republican challenger, Morgantown business executive John Raese, 60, gaining significant ground. With polls giving surging Republicans an outside chance of gaining the 10 Senate seats needed to reclaim the majority,...