WASHINGTON — Billionaire hedge fund investor Bill Ackman, a leading public critic of university presidents who failed to condemn calls for genocide against Jews during a congressional hearing last week, was scheduled to co-host a fundraiser for Republican presidential candidate Chris Christie on Thursday at a New York law firm, according to an invitation. The founder of Pershing Square Capital Management previously gave the maximum $3,300 primary donation to Christie’s campaign in September — and he's contributed the same to two other presidential candidates, according to Federal Election Commission records. Ackman gave to Christie primary rival Vivek Ramaswamy in April...