As far as I know, Detroit Mayor Mike Duggan isn’t a gambler, but if he were, you probably wouldn’t want to bet against a horse he was backing. Yesterday, when he endorsed Gretchen Whitmer at her headquarters in his city, it was a clear indication that the Democratic nomination for governor is now hers, unless she makes some kind of cataclysmic mistake. Though the primary is still five months away, Duggan, to an extent, was ratifying the obvious. Whitmer, a former minority leader in the state