URBANDALE, Iowa — Herman Cain’s Iowa state director thumbed through a stack of supporter sign-up forms at the campaign’s headquarters here, telling ABC News that the sexual harassment allegations that have rocked the Cain campaign this week have actually been a “catalyst” in this state. Larry Tuel, who runs Cain’s campaign in Iowa, said that the endless stream of news stories on Cain’s alleged misbehavior toward women have attracted new supporters and emboldened existing ones. “The story has made some people angry,” Tuel said in an interview on Thursday. “We think that people want to show their support for Mr....