Former Republican congressional candidate H. Russell Taub pleaded guilty to fraud and breaking campaign finance law as part of an illegal political action committee, the U.S. Justice Department and FBI announced Thursday.Investigators last month charged Taub, 30, of Cranston, with spending more than $1 million in political donations on personal expenses including travel, meals, clothes, cigars, strip-club visits and escorts. Taub, who unsuccessfully challenged U.S. Rep. [...]