sentences:  Several former candidates, including Mendoza, Chico, Paul Vallas, and fourth-place finisher Willie Wilson also endorsed Lightfoot in the runoff.In an additional blow to Preckwinkle, Jesús "Chuy" García, who had been previously an ally of Preckwinkle's and floor leader for her on the Cook County County Board of Commissioners, endorsed Lightfoot (Preckwinkle herself had declined to endorse Garcia in the runoff of the previous 2015 Chicago mayoral election).Lightfoot held a substantial lead over Preckwinkle in polls conducted during the runoff campaign.