Brand new CNN polls show the clues and data that could determine the balance of power in two of the tightest races in the country. Also, a mass shooting suspect pleads guilty to killing his classmates and his parents are accused of giving him easy access to the guns. Prosecutors call this a landmark case. Plus, Republican Senator Lindsey Graham asks the Supreme Court for help in his fight against a subpoena in a case trying to get to the bottom of election interference.

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