Bastiaan Slabbers/AP

Amid high anxiety and an internal rebellion over his ability to beat Donald Trump, President Joe Biden has remained defiant, even daring his skeptics to “challenge” him at the Democratic National Convention next month.

“Run against me, go ahead,” he said. “Announce for president. Challenge me at the convention.”

But it turns out that such an opportunity might not be available, suggesting that Biden’s boast wasn’t quite the confident provocation it seemed. That’s because the DNC is quietly moving forward with plans to hold a virtual roll call as early as next week, spearheaded by a committee of delegates who have been “vetted” for their loyalty to Biden, the New........

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