The official Democratic Socialists of America watch party hit capacity at the incongruous choice of a Bavarian beer hall well before polls had even closed.

The venue was packed with volunteers and Mamdani supporters who wanted to be well-located if he managed to pull off what a year ago would have been seen as almost impossible victory.

Ever since senator Bernie Sanders took on and almost beat Hillary Clinton in the 2016 presidential primary contest , the progressive wing of the Democratic Party has been attempting to prove that it can both energise the base and win elections.

When Zohran Mamdani was announced victorious , the crowd erupted with cheers. A chant of "tax the rich" rang out in triumph.

The fringe group has now seized one of America's major electoral prizes: control of

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