I also am in Michigan, and as a comparison, my clerks just got their increases, which amounts to about $70 extra a month.
These are very mean and mean times for the auto industry, and I am constantly seeing people who cannot find work.
Was it the presentation? What if your supervisor had brought you in and discussed these great new responsibilities, where you would learn a lot, and be poised to move up, up, up, in the future. Oh, and there is also a raise, too. I know for me that would be a great pitch, because the exciting new job would be great, and the extra money would be gravy.