Morris Katz helped orchestrate Zohran Mamdani’s historic victory and Graham Platner’s ultimately disastrous run for Senate. It’s quite a résumé  for a political consultant who is still in his 20s. Platner’s implosion could prove particularly costly for Democrats. It may mean the difference between winning and losing a Senate majority. But before the rape accusation that ended his campaign, Platner had come out of nowhere to beat Janet Mills, the sitting governor of Maine, who was Chuck Schumer’s hand-picked candidate. The lessons to take from that campaign remain angrily contested. Katz, a senior adviser to Platner, has been central to many of the most attention-grabbing, populist campaigns in recent years: Besides Mamdani’s New York mayoral upset, he worked on John Fetterman’s 2022 Senate campaign and Dan Osborn’s 2024 independent Senate run in Nebraska. He has figured something out about this political moment. Along the way, he has become a controversial figure himself. So what has he gotten right? And what has he learned from what he’s gotten wrong?