This combination photo shows presidential candidates Rodrigo Paz, left and Bolivia’s former President Jorge Quiroga, right. (Freddy Barragan, Arnulfo Franco | AP)LA PAZ, Bolivia — Bolivia’s presidential vote headed to an unprecedented runoff after a vote Sunday that ended more than two decades of left-wing dominance in the Andean nation but signaled voters’ trepidation about a major lurch to the right. “Always Bolivia, everything for Bolivia,” Paz declared to cheering crowds. Simmering discontent turned into a tidal wave of anger at the MAS party as Bolivia’s once-stable economy imploded under Morales’ protégé-turned-rival, President Luis Arce. But he has also launched blistering attacks on the MAS party and its state-directed economic policies.