Insurgents from the left threaten to upend Democratic Party plans in Tuesday primaries

The progressive wing of the Democratic Party hasn’t had much to celebrate at the ballot box since populist Sen. Bernie Sanders suspended his presidential campaign two-and-a-half months ago.

But the left appears to be storming back, giving more moderate Democratic candidates some serious competition in newly competitive primaries in Kentucky and New York, two of the states holding contests on Tuesday.

The premier showdowns grabbing the national spotlight are the Democratic Senate primary in Kentucky, where establishment-backed Amy McGrath – who had been the heavy favorite and enjoyed a massive fundraising advantage – is facing a serious threat from progressive candidate and state Rep. Charles Booker.

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