What voters are watching for in tonight's debate?

The vast majority of 2020 voters already have their mind made up about who they're casting their ballot for, so why are they tuning in to the first debate between President Trump and Joe Biden. CBS News director of elections and surveys Anthony Salvanto joins CBSN's "Red and Blue" host Elaine Quijano to discuss why people are watching.

Watch video on channel "CBS News"

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