brasilia centrist brazilian social democracy party psdb elect four-time sao paulo governor geraldo alckmin leader saturday make likely presidential nominee next year elections alckmin throw party weight behind social security overhaul currently congress would cut generous pension public-sector employees pension reform necessary two class brazilian citizens tell convention elect 470-3 vote alckmin say former leftist president luiz inacio lula da silva likely rival 2018 race lead brazil bad recession big corruption scandal lula want return scene crime tell cheer supporters sure defeat poll alckmin pick unite divide party supporters opponents brazil unpopular president michel temer plan complete psdb withdrawal govern coalition alckmin make clear psdb would back temer pension proposal investors consider crucial close huge budget deficit cost latin america large economy investment-grade credit rat elections less year away psdb lawmakers want distance temer half 46 congressmen back low house vote august block corruption charge alckmin must overcome party brush brazil ongoing political corruption scandal succeed senator aecio neves party defeat 2014 presidential candidate investigation allegedly ask jail joesley batista owner meatpacker jbs sa million reais 607,500 illegal fund neves boo quickly leave convention cast vote psdb disengagement temer administration almost complete friday resignation antonio imbassahy president minister political affairs alckmin 65 governor brazil rich populous state 2001-2006 2011 run president 2006 lose lula still brazil popular politician despite corruption conviction could bar run even land prison former brazilian president psdb founder fernando henrique cardoso two elections lula say good defeat poll put jail brazil 's psdb pick sao paulo gov alckmin lead 2018 race