The state's governor passed a bill--supported by GM--that stops Tesla from selling its own cars.
On Tuesday, Michigan governor Rick Snyder signed legislation that all but stops Tesla from selling cars in the state. The legislation doesn't specifically name Tesla, but the state has now effectively shut down the methods by which Tesla sells its cars--meaning either Tesla will have to change its ways, or forgo any sales in Michigan. (A third option, a lawsuit, is always possible.)