Simon Rosenberg was right about the congressional elections of 2022. All the conventional wisdom — the polls, the punditry, the fretting by fellow Democrats — revolved around the expectation of a big red wave and a Democratic wipeout.

He disagreed. Democrats would surprise everyone, he said again and again: There would be no red wave. He was correct, of course, as he is quick to remind anyone listening.

These days, Mr. Rosenberg, 60, a Democratic strategist and consultant who dates his…

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