“Historians and pundits always say that the first real decision a governor makes is the one of running mate,” Cuyahoga County Executive Ed FitzGerald, Ohio Democrats’ likely nominee for governor next year, wrote to supporters when he announced he had chosen state Sen. Eric Kearney (D) as his running mate. FitzGerald may be starting to wish voters weren’t paying attention to his first gubernatorial decision. That’s because, in the two weeks since joining the ticket, Kearney has been under almost constant barrage for owing back taxes to the Internal Revenue Service. And the campaign’s response to the revelations about their...