According to Think Progress,
A landmark new study conducted by the Center for Public Integrity, Global Integrity, and Public Radio International grades the level of corruption in each states. The least corrupt states were Connecticut, Washington, California, Nebraska, and despite popular conception to the contrary, New Jersey. Eight states in total received the ignominious honor of “most corrupt“: Georgia, Maine, Michigan, North Dakota, South Carolina, South Dakota, Virginia, and Wyoming. Notably, all eight states have both Republican governors and Republican-controlled legislatures. It appears the nation has been misguided in its focus on “Chicago-style corruption”; it is now time to turn our attention to the perils of Cheyenne-style corruption.
Full details here.