One of the many under-reported elements of Trump’s surprising ascendance was the critical role his son-in-law Jared Kushner played in the campaign, and in particular the build-out of a highly innovative and effective data-mining operation that belied the seemingly haphazard nature of the campaign as a whole. Fortune has a fascinating insider’s look into the operation and Kushner himself, who is sure to play a prominent role in the administration, even if behind the scenes.