Alexi Giannoulias leads trader consensus in the 2027 Chicago mayoral race due to his commanding fundraising edge of over $22 million and strong name recognition as Illinois secretary of state, factors that have separated him from a crowded field ahead of the February 23 primary and potential April runoff. Incumbent Brandon Johnson’s low approval ratings and limited enthusiasm for a reelection bid have opened space for challengers including Susana Mendoza, Mike Quigley, Maria Pappas, and George Cardenas, who are actively circulating nominating petitions. The large number of declared and speculated candidates, combined with early-stage polling volatility and unresolved questions about voter priorities on public safety, the budget, and economic growth, keeps probabilities tightly clustered for most contenders. Upcoming petition deadlines and any shifts in campaign resources or endorsements could widen gaps before voters decide.