NEW : Rahm Emanuel pledges to tackle `` serious new challenges '' in Chicago . Former aide to President Barack Obama gets over half of vote to avoid a runoff . TL;DR Illinois Democratic primary results show that former White House chief of staff will face off against Cook County Board president Toni Preckwinkle. Emanuel will succeed Richard M. Daley , who held the office since 1989 .
NEW : Rahm Emanuel pledges to tackle `` serious new challenges '' in Chicago . Former aide to President Barack Obama gets over half of vote to avoid a runoff . Former Chicago School Board head Gery Chico is in second place . Emanuel will succeed Richard M. Daley , who held the office since 1989 .