The race to become Mexico's next president has closed slightly, but former Mexico City mayor and ruling party candidate Claudia Sheinbaum still has double the support of her main opposition rival, an opinion poll showed on Monday. A Nov. 17-22 survey of 1,000 Mexicans by pollster Buendia & Marquez for newspaper El Universal gave Sheinbaum, who represents the leftist National Regeneration Movement (MORENA), 48% support, with her rival Xochitl Galvez back on 24%. Galvez represents a three-way alliance of parties ranging from the center-left to the center-right.