Biden's disastrous debate performance offers lessons for Harris and warnings for Trump

A look back at the June 27th presidential debate provides reminders that Vice President Kamala Harris should treat the event as a visual exercise where every camera angle tells a story. Debates don’t often change the course of a presidential campaign, but an exception took place that night. That’s when Joe Biden stumbled through his faceoff with Donald Trump, leading to cratering support among Democrats. Harris replaced Biden at the top of the ticket, and she’ll have her own chance to take on Trump in Philadelphia on Tuesday. Trump also has plenty of vulnerabilities that Harris will seek to exploit in ways that Biden fell short.