Andy Kim was in the middle of a campaign event last year when he got a call from a hospital. His father, who was born with polio and has dealt with a lifelong disability, had tripped in a parking lot and broken his femur. But when Kim got to the hospital, doctors seemed less concerned about the fracture and more worried about how disoriented his father seemed.

“He had literally no idea where he was,” Kim tells me.

Over the next several months—as Kim ran for and eventually won the seat vacated by disgraced New Jersey senator Bob Menendez —he saw more and more signs that something might be wrong with his father. An appointment this September confirmed it: His father, a Korean immigrant who sought a cure for Alzheimer’s while working as a geneticist, was among the estimated 7.2 million

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