Billionaire investor Bill Ackman is escalating his commentary on the New York City mayoral race, claiming Republican Curtis Sliwa’s refusal to exit has pushed democratic socialist Zohran Mamdani to a 90% chance of victory, according to prediction market data.  Ackman, the founder of Pershing Square Capital, argued that Sliwa staying in the race is helping Mamdani secure the win. On Friday, Ackman posted new Polymarket odds on X...