Alexi Giannoulias holds the leading position in the 2027 Chicago mayoral race due to his substantial fundraising edge of roughly $22 million, broad union and business endorsements, and higher voter excitement in early surveys compared with other contenders. Incumbent Brandon Johnson formally launched his reelection bid in mid-September despite approval ratings in the low-to-mid 20s and polls showing limited enthusiasm for another term, amid a projected $882 million city budget shortfall and ongoing council tensions over revenue measures. The February 23 primary in a crowded field of more than a dozen candidates, including Susana Mendoza, Mike Quigley, and Maria Pappas, increases the likelihood of a runoff and keeps probabilities fluid until petitions close and clearer head-to-head data emerges.