Rahm Emanuel has a commanding lead in the Chicago mayor's race, but many voters remain undecided, according to a new poll.

The former White House chief of staff has the support of 32 percent of voters, with 30 percent undecided, a Chicago Tribune/WGN poll released Wednesday found.

He was the only candidate in the crowded mayoral primary field with double-digit support.

Former Chicago Public Schools official Gery Chico and Rep. Danny Davis each had 9 percent, with state Sen. James Meeks at 7 percent and former Sen. Carol Moseley Braun at 6 percent.

A third of African-Americans are undecided. While 19 percent are backing Emanuel, Meeks gets 13 percent and 10 percent are supporting Braun.

The news comes as Emanuel and his camp prepare for the third day of a Chicago Board of Elections hearing into some 30 challenges to his eligibility for the February ballot. Objectors have challenged Emanuel's eligibility based on the requirement that candidates must live in Chicago for a year prior to the mayoral election.