From the DFP:
Diane Hathaway sprung a stunning upset Tuesday of Clifford Taylor, the conservative chief justice of the Michigan Supreme Court who was the target of a scathing advertising campaign from Democrats.
Hathaway, a Wayne County Circuit Court judge nominated by the Democrats, is the first challenger to unseat an incumbent justice since 1984.
The loss is a devastating blow to the Michigan Republican Party, which was braced for a bad night elsewhere on the ticket but badly wanted to re-elect Taylor, who has been a critical member of the conservative majority that has ruled the court the last decade.