Bernie Sanders Is Not Doing the Democrats Any Favors

Mr. Yglesias, a contributing Opinion writer, writes extensively about politics, economics and more at the newsletter Slow Boring.

The primary win in the Michigan Democratic Senate race by Dr. Abdul El-Sayed, a progressive former public health official, marks the latest, and perhaps most surprising, instance of the insurgent left’s electoral success at beating establishment incumbents or candidates. It is another episode in the political story of the summer — the sense that something like a left-wing Tea Party is afoot.

These candidates are running for a very progressive........

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