The Democrats finally have their groove back—or at least a semblance of a groove.

For the first time since Donald Trump was elected a year ago, the Democratic Party’s general vibe is one of tentative celebration. And why shouldn’t it be? On Tuesday, candidates from very different ideological wings of the party sailed to comfortable victories in three states. And residual excitement from that election was in the air yesterday at Crooked Con—an event brought to you by Crooked Media, which was brought to you by the Pod Save America guys, who were brought to you by the Obama White House—where party strategists and activists shared a stage and mingled over room-temperature soft pretzels.

The convention was held, somewhat awkwardly, at the Ronald Reagan Building in Washington, D.C., and was in

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