Alexi Giannoulias holds the clearest edge in the 2027 Chicago mayoral race, driven by his $22 million-plus campaign fund, statewide name recognition as Illinois secretary of state, and endorsements from multiple trade unions and city council members following his August 2 announcement. Early polling shows low excitement for incumbent Brandon Johnson’s reelection bid, which he formally launched on September 13 amid 23% approval and a crowded field that includes Susana Mendoza, Mike Quigley, Maria Pappas, and George Cardenas. Petition circulation began in late July with a late-October filing deadline ahead of the February 23 first-round vote and potential April runoff. Traders appear to price in Giannoulias’ structural advantages in fundraising and organization while viewing the fragmented opposition and Johnson’s challenges as barriers to any single rival consolidating support before the primary.