Morena maintains a commanding position in the race for Mexico’s 2027 legislative election, with traders assigning it an 87 percent implied probability of securing the most seats in the Chamber of Deputies. This reflects the party’s continued dominance following its 2024 supermajority and the sustained popularity of President Claudia Sheinbaum’s administration. Recent internal party leadership changes under Ariadna Montiel and ongoing electoral reform discussions have reinforced organizational strength and voter alignment ahead of the June 2027 vote. Opposition parties such as PAN, PRI, and MC show limited momentum in current polling averages, constrained by fragmented voter bases and weaker national profiles. No major shifts have emerged in the past month to alter these dynamics, though upcoming candidate selection processes and any further judicial or institutional reforms could introduce new variables before election day.