Mr. Biden will almost assuredly make jokes at Mr. Trump’s expense and poke fun at the Washington press corps. But Mr. Biden could also take a victory lap for a spate of good news in recent days. On Thursday, Mr. Biden promoted a $6.1 billion grant to a chip manufacturer that he said would bolster the nation’s supply of semiconductors, contributing to what he has labeled “the great American comeback story.”And on Friday, Mr. Biden made a surprise visit to “The Howard Stern Show,” hosted by America’s best-known shock jock. The president spoke at length about deeply personal events, showing an emotionally vulnerable side to Mr. Stern’s large audience of middle-class Americans. And, in a notable shift, he said he would debate Mr. Trump.

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