American filmmaker Ken Burns is actively fundraising for Democratic Sens. Mark Kelly (Ariz.) and Kirsten Gillibrand (N.Y.). Burns, known for critically acclaimed documentaries including “The Civil War” and “The Vietnam War,” has put his name on several emails sent out by Kelly’s campaign. In one fundraising email, Burns noted that the Arizona senator is a retired Navy captain who landed 299 times on the USS Midway during his career. “A Navy pilot contends with the ocean, the wind, and the aircraft carrier — not to mention their own plane. It’s one of the most challenging things a person can do,...