PVEM holds the strongest position in trader consensus for the San Luis Potosí state congress election due to its current majority bancada, control of the Mesa Directiva, and consistent leads in recent party-preference surveys ahead of the June 2027 vote. The party secured nine seats after the 2024 results and maintains influence through alliances in the LXIV Legislature. Morena’s decision to contest alone, breaking from prior PVEM-PT coordination, has fragmented the former coalition and lowered its implied probability. Recent congressional approval of electoral reforms, including voluntary integrity evaluations and coalition rules, passed with broad support and was upheld by the SCJN in early November, providing procedural clarity before the November 15 process start. These factors shape the market’s assessment of the path to the largest share of the 27 seats.