During the debate, Biden - who would be 82 at the start of a second term - was slow to answer in some instances, and struggled to form coherent arguments.
Media appearances failed to assuage concerns as Biden continued to make minor flubs and major errors, raising questions about the campaign's control over his appearances.
Rep. Lloyd Doggett was the first Democrat in Congress to call for Biden to step aside, reflecting a growing pressure from other lawmakers on Biden to withdraw from the race.
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