Oct. 14 (UPI) -- With less than a week to go before Bolivia's presidential runoff, polls show a narrow lead for conservative former President Jorge "Tuto" Quiroga, of the Free Alliance, with voter support ranging between 43% and 45%.

His opponent, Rodrigo Paz Pereira, of the Christian Democratic Party, has between 36% and 39%. However, 18% to 20% of undecided voters are expected to determine the outcome.

A survey by Ipsos Ciesmori for the television network Unitel, published Sunday, shows Quiroga leading with 44.9% compared with 36.5% for Paz. Still, the high number of undecided voters could shift the trend.

Bolivia is preparing for an unprecedented presidential runoff on Sunday that features two right-leaning candidates. Nearly 8 million Bolivians are registered to vote.

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