Support is eroding. Can President Biden hang onto the nomination?

On June 27th, long-simmering concerns about President Biden's age – and whether he's fit to serve a second term – exploded after a disastrous debate performance.

Biden has been trying to clean up the mess ever since. First at a fiery rally in North Carolina. And some ten days after the debate in a one-on-one interview with ABC's George Stephanopoulos.

Neither event accomplished the goal of shoring up support for Biden, and now members of Congress are questioning whether the 46th President should remain the democratic nominee.

Evan Osnos, New Yorker staff writer and author of a biography on Joe Biden, weighs in on the Biden campaign at a crossroads.

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