Midwest day of rest for car dealerships

Can anyone fathom why most of the states in the Great Lakes Region have taken the time to write up, debate, and vote on whether or not car dealerships should be allowed to set their own hours? At least Michigan, Illinois, Iowa, Indiana, and Wisconsin have made it illegal for car dealerships to conduct business on Sundays.

I can't imagine the scenario that made this the important issue that had to be dealt with that day...

THIS is whyipaytaxes.