Bolivia to vote in presidential runoff that will turn it to the right

End of almost two decades of leftist rule could revive war on drugs' in change of approach to coca cultivation

Bolivians go to the polls on Sunday in an election that, whatever the result, will mark a complete shift to the right after nearly 20 years under the rule of the leftist Movimiento al Socialismo (Mas).

The country's first-ever presidential runoff pits the centre-right senator Rodrigo Paz Pereira, 58, who won the first round in August, against the rightwing former president Jorge Tuto" Quiroga, 65, who in recent weeks has overtaken Paz Pereira in the polls.