One of Chicago Mayor Rahm Emanuel's lesser-known challengers has conceded the race as votes are still being counted.
William "Dock" Walls is a perennial candidate. He was an aide to late Chicago Mayor Harold Washington in the mid-1980s. He's since been a businessman and activist.
He devoted a speech Tuesday evening to issues he believes need attention in the city and the importance of voting.
Polls consistently had him last among the five candidates running for mayor. With about 75 percent of precincts reporting, he had less than 3 percent of the vote.
Emanuel is seeking a second term. The others challenging him are Alderman Bob Fioretti, Cook County Commissioner Jesus Garcia and businessman Willie Wilson.