First: It's T-minus four days and 62 million Americans have already cast their ballots as Kamala Harris and Donald Trump blitz the battlegrounds with their closing arguments to that little, little sliver of persuadable voters. 

Plus: Trump says he'll let RFK Jr. "do anything he wants" with health and vaccine policy if the former president is back in the White House. 

And: $2 billion has now been poured into presidential political ads this election season. We break down the ones that work with two top political strategists. 

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