Reform-oriented Democrats supported a challenge by alderman John S. Boyle to incumbent mayor Edward J. Kelly.[1] This challenge failed to amount to much, with Kelly easily defeating Boyle.
Chicago Democratic mayoral primary (February 23, 1943)[2]
Like other Republicans that had run against Kelly, McKibbin framed his campaign as a crusade against machine politics.[1] McKibbin declared "Pendergast is out in K.C., Hague in Jersey, and Tammany in New York have been cleaned out. Now it is time to clean out the Kelly-Nash machine."[1] McKibbin also attacked links between the political machine and criminal activity.[1] Kelly did not campaign. Confident in his chances of victory, Kelly flaunted heavy gravitas and balked at the thought of campaigning.[1]