U.S. Democratic primary battles between moderates and progressives

A series of state Democratic primaries across the U.S. are testing the balance of power between the party's moderate establishment and its progressive wing. Key contests have taken place in Connecticut, Minnesota, Wisconsin, Michigan, and Alabama, involving veteran incumbents and challenger candidates backed by different factions of the party. The outcomes are seen as significant in shaping the Democratic Party's direction heading into the midterm elections. The arc follows AP decision-note previews of each primary as they unfold state by state.