Because he was another philanderer who spent more time with his mistresses than he did with his own wife. If he was a real threat to either candidate there would be females coming out of the woodwork to tell their stories. That's why his whole family is out in front of it because others may be implicated..
We might actually find out what really happened to Martha Moxley or the events that led up to the tragedy in Chappaquiddick.
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