A trove of newly released documents has raised new questions about ties between the campaign of Wisconsin Republican Gov. Scott Walker and his former post in county office. Walker served as Milwaukee County executive while running for governor in the 2010 election. Two of Walker’s aides have been criminally convicted of conducting campaign business on the taxpayer dime. Documents unsealed Wednesday reveal just how closely Walker and his aides blurred campaign and official business. They link Walker to a secret email routing system used by his county staff and show he directed county staff to hold daily strategy calls with campaign aides. The revelations come as Walker eyes a potential presidential bid in 2016.