Will tonight’s debate between Vice President Harris and former President Trump be as dramatic as the game-changer on June 27 between Trump and President Biden? That debate served to confirm what everyone already suspected: the reality that Biden’s age and mental decline make him unfit to serve another four years, despite the repeated public denials by Harris, administration officials, and congressional Democrats.

Biden’s insistence on holding on to power contrary to his 2020 assurance that he would only serve as a “bridge” president, and his party’s timidity in refusing to challenge his Trump-like obstinacy, jeopardized not only Democrats’ prospects for holding on to the White House but also their prospects in Congress and state offices. The long delay in acknowledging political and geriatric reality put Democrats in a desperate situation to replace Biden before their national convention.

Biden and party leaders compounded the error by precluding any kind of competition or discussion of alternatives to Harris. Her subsequent refusal to engage with journalists in press conferences or solo interviews raises doubts about the honesty of her candidacy and her competence to serve as commander in chief.

This debate will be the first opportunity for the press to question her seriously one on one. How the former senator performs could have a major impact on her election prospects.

The stakes for Trump are even higher. Biden’s infirmity was so........

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