Key Primaries in Six States

It's primary night in America, and once again the Democratic Party's progressive wing could score significant gains. There are key races in Wisconsin, Minnesota, and a crowded primary in South Carolina for the state's next full Senate term featuring Sen. Darline Graham, the late Senator Lindsay Graham's sister.  Plus, all we've been learning since news broke last night about the president's airplane switch up in the face of Iranian threats.

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