民主党规定，除非拜登下台，否则选举前不得有人取代他成为总统候选人。 Democratic rules prevent replacing Biden as presidential candidate before election unless he steps aside.

尽管人们对乔·拜登的辩论表现感到担忧，但除非他选择下台，否则民主党几乎不可能在大选前取代他成为总统候选人。 Despite concerns over Joe Biden's debate performance, it would be nearly impossible for Democrats to replace him as their presidential candidate before the election unless he chooses to step aside. 民主党规则规定，拜登赢得的代表必须在即将召开的全国代表大会上支持他，除非拜登告诉他们他将退出竞选。 Democratic rules mandate that delegates won by Biden remain bound to support him at the upcoming national convention unless he tells them he is leaving the race.