In a major boost to Andrés Manuel López Obrador’s consolidation of his control over Mexico’s political Left, the leader of the PRD in the Senate, Miguel Barbosa, endorsed AMLO for president. (The PRD Central Committee demanded Barbosa’s resignation, but he has so far refused.) Columnist José Rubenstein notes that the PRD is disintegrating. The party’s parliamentary group had 22 Senate seats at the beginning of 2016, and defections have reduced the number to 12. And if Barbosa and his allies leave, the PRD would be down to seven senators.