MADISON, Wis. — Wisconsin Gov. Scott Walker has vowed to clean up the Obama administration’s mess, and he intends to do so without using any additional money from the state’s general purpose revenue fund. The Republican governor has called for legislation to extend BadgerCare coverage by three months for close to 80,000 Wisconsin residents while the federal government irons out the kinks that have massively disrupted the Affordable Care Act’s online exchange systems. Approximately 77,000 Wisconsinites were expected to switch from BadgerCare Plus — the state’s version of Medicaid — to the new federal insurance plans on Jan. 1, but...