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.

A dark horse centrist, Sen. Rodrigo Paz, drew more votes than the right-wing front-runners, although not enough to secure an outright victory, early results showed.

Paz, a former mayor who has sought to soften the edges of the opposition's push for tough austerity to rescue Bolivia from economic collapse, will face off against right-wing former President Jorge "Tuto" Quiroga, who finished second. Bolivia will hold the second round — its first presidential runoff since its 1982 return to democracy — on Oct.

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