President Joe Biden and former President Donald Trump won the Michigan primaries on Tuesday‚ further solidifying the all-but-certain rematch between the two men. Biden defeated Minnesota Rep. Dean Phillips‚ his one significant opponent left in the Democratic primary. But Democrats were also closely watching the results of the “uncommitted” vote‚ as Michigan has become the epicenter for dissatisfied members of Biden’s coalition that propelled him to victory in the state — and nationally — in...