Hedge-fund manager Bill Ackman asked JPMorgan CEO Jamie Dimon what he'd do if he were president. The CEO said he'd get rid of the carried interest loophole and increase the earned income tax credit. What would one of the most powerful billionaire CEOs do if he were president? Tax people like himself — and his fellow billionaires — more. At the New York Times DealBook Summit this morning, audience member and hedge fund titan Bill Ackman asked JP Morgan CEO Jamie Dimon what he'd do if he were president.