PAN leads the market for second place in Mexico’s June 2027 Chamber of Deputies election because national polling through mid-2026 consistently places it ahead of other opposition parties in vote intention, positioning it as the primary challenger once Morena secures first. Traders price PAN near 80 percent on the strength of its established national organization, recent gubernatorial performance in key states, and voter consolidation among non-Morena blocs. PRI, PVEM, and MC trail in the same surveys, reflecting fragmented opposition support and limited recent momentum. Morena’s dominant standing leaves little room for it to finish second, while coalition dynamics among smaller parties further reduce their upside. With more than ten months until voting, scheduled state-level contests and any shifts in Sheinbaum administration approval could still alter relative opposition rankings.