BOISE, Idaho -- Idaho is leading the charge in a states-rights push to defeat a proposal in Congress that would require people to buy health insurance, a key piece of reforms being pushed by President Barack Obama.Republican Gov. C.L. "Butch" Otter used a ceremony Wednesday afternoon to become the first governor to sign into law a measure requiring the state attorney general to sue the federal government over any such insurance mandates.There's similar legislation pending in 37 other states, a point Otter stressed when asked if the bill he signed can succeed, given constitutional law experts are already saying federal laws would supersede those of states in a U.S. District Court fight.