Josh Kushner's expectation: By the time he touched down, the Trump political experiment would be retired as a historical ego trip. Pre-Trump, Kushner had pretty much everything an ambitious 31-year-old could possibly hope for: a $1.5 billion venture capital shop that shot to prominence with an early bet on Instagram, a slew of high-profile startups that he was directly incubating and a life that remained low-profile even as he dated supermodel Karlie Kloss. The Trump Train had derailed much of that. Press and paparazzi gobbled up everything Kushner, family demons included, while Josh found himself linked, at least in perception, to proposals most of the tech community abhors....