As Joe Biden jumps in, the ‘front-runner’ concept gets scrambled

The speculation over whether or not former Vice President Joe Biden would join the crowded 2020 Democratic primary field officially ended Thursday when he released a video declaring his bid for president. The announcement was almost a formality. From the start of the campaign cycle, the press has treated Mr. Biden – a five-term U.S. senator and popular two-term vice president – as though he were already running.

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