Why GOP efforts to turn Sanders supporters off Biden don't appear to be working.

At several points during the first presidential debate Tuesday night, President Trump tried to drive a wedge between the Democratic Party's centrist and left wings. Sean Sullivan, a CBSN political contributor and national politics reporter for the Washington Post, spoke to "Red and Blue" host Elaine Quijano about why the strategy to pull votes away from Biden doesn't seem to be working.

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