JD Vance makes his debut as Donald Trump's running mate and doesn't exactly hit a home run. Joe Biden tests positive for COVID, details leak out about Chuck Schumer's tough-love conversation with the president, and the DNC blinks in the standoff over its plan for a virtual roll call. Jon, Lovett, Tommy, and Dan break down a truly packed day of news, from the problems with Vance's speech to the latest polling about the future of the Democratic ticket.

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