The Don Blankenship comeback tour has come to a screeching halt. The West Virginia Republican and former coal baron, who was running for US Senate less than a year after completing a federal prison sentence, finished a distant third in Tuesday’s Republican primary. He conceded while the race between his opponent, Rep. Evan Jenkins and state Attorney General Patrick Morrisey, was still too close to call. Morrisey was eventually declared the winner; he’ll face incumbent Democrat Joe Manchin in a contest that could decide control…