Ahead of the midterms, Democrats face reckoning in Michigan primary

Five states hold primary elections with all eyes on high-stakes Michigan Senate race

Democratic primaries in states like Michigan and Missouri present opportunities for progressives to defeat moderates on Tuesday, as the political left hopes to build on its success in earlier races.

Many races will have implications not just for residents, but also for Democrats nationwide.

Several of the contests on Tuesday will help shape the battle for control of the US Congress, where Democrats need to flip four Senate seats and three House of Representatives seats to regain the majority.