Iowa on front lines of immigration debate

MARSHALLTOWN, Iowa - Two decades after he left his native Mexico and eight years after he moved to Iowa, Jose Castillo is tired of being a scapegoat. "We are not terrorists," he said. "We are not murderers. We are not bad people. A lot of innocent people are being blamed for things just because they're Mexican." Castillo, a parish worker at St. Mary's Catholic Church who says he came to America legally, personifies a demographic earthquake that is reshaping Iowa's culture and politics and shaking up the presidential campaign. Hundreds of miles from the Mexican border, Iowans find themselves on the front line of the bruising national debate over immigration policy. Running hard toward next week's kickoff presidential caucuses, candidates, e