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CBS News Battleground Tracker poll finds Biden with a 10-point lead nationally

CBS News Battleground Tracker poll finds Biden with a 10-point lead nationally

The CBS News Battleground Tracker poll, conducted prior to the Democratic National Convention, had Joe Biden leading President Trump 52% to 42% nationally. CBS News' director of surveys and elections Anthony Salvanto joins CBSN's Elaine Quijano on "Red & Blue" to dive into the poll's findings.