The fourth Democratic debate this week highlighted Elizabeth Warren’s new front-runner status. It also marked the return to public events for Bernie Sanders, who showcased his energy following a heart attack and touted a key new endorsement from Alexandria Ocasio-Cortez. The two progressive candidates haven’t gone after each other thus far. How much longer will that last? And where does the race go from here?

Joining Isaac Dovere this week is Elaine Godfrey, who reports on progressive politics for The Atlantic.

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