Abner Mikva. Photo: White House.

AP – Abner Mikva, a liberal stalwart from Illinois who served in all three branches of the federal government, mentored a young Barack Obama and famously learned firsthand the brazen nature of Chicago’s political machine, has died.

The 90-year-old died of bladder cancer Monday at Rush University Medical Center in Chicago, Steven Cohen, who is married to Mikva’s oldest of three daughters, told The Associated Press.

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