In the last years of his long and remarkable life, Daniel Ellsberg, the disenchanted military analyst who famously leaked the so-called Pentagon Papers in 1971, wanted to be prosecuted. And he hoped I would help pave the way. The charge he coveted was mishandling national security secrets under the Espionage Act, and his plan was to give me another classified document he had taken decades ago that he had held onto without authorization all this time. He wanted to mount a defense in a way that would offer the Supreme…