By Alexander Villegas and Fabian Cambero

SANTIAGO, Dec 14 (Reuters) – Chileans will vote in a runoff presidential election on Sunday that is expected to result in the South American country’s sharpest rightward shift since the end of the military dictatorship in 1990.

Nearly 15.6 million registered voters in Chile are set to cast ballots. Polls will close at 6 p.m. local time (2100 GMT), pending voter lines, with initial results expected soon after.

The runoff pits ‍Jose Antonio Kast, from the far-right Republican Party that he founded, against Jeannette Jara, the incumbent leftist government’s coalition candidate from the Communist Party.

While Jara won November’s first round with 26.85% of the vote, Kast beat out an array of right-wing candidates to finish second with 23.92%. Most of

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