DETROIT -- Mike Duggan says the coming year will be his last as Detroit mayor, amid growing speculation he’s among the Democrats likely to launch a gubernatorial campaign to succeed term-limited Gov. Gretchen Whitmer.

Detroit Mayor Mike Duggan will not run for a fourth term, he announced Wednesday to an auditorium full of city hall employees. Why it matters: Duggan bowing out comes as little surprise; the 66-year-old Democrat,