RALEIGH, N.C. — North Carolina's largest political donor and three others, including the chairman of the North Carolina Republican Party, have been arrested on bribery charges. Greg Lindberg, two of his business associates and N.C. GOP Chairman Robin Hayes were all indicted last month, but the indictments were unsealed Tuesday. They turned themselves in to the FBI in Charlotte Tuesday as well and had first appearances before a U.S. magistrate. They're all accused of trying to bribe state Insurance Commissioner Mike Causey, who recorded conversations and worked with the FBI to expose an alleged scheme that would have traded more...