The Detroit News has the story, here:
Senate Minority Leader Gretchen Whitmer, D-East Lansing, described the process as "unnecessary" and costing taxpayers $10 million. The candidate selection, she argued, should have been handled via a party caucus, which is how the Democrats will choose their delegates in May.
"Since you chose to play games with Michigan's elections, don't be surprised if voters choose to play games with your phony primary as well," she warned Republicans.