SANTIAGO, Chile (AP) — Chileans face perhaps the starkest choice in the history of their country’s young democracy when they vote next month in a presidential runoff that pits hard-right José Antonio Kast against communist Jeannette Jara . Neither candidate cleared the 50% threshold to win, but Kast heads into the second round of voting best positioned to succeed after an unprecedented 70% of voters backed an array of right-wing parties in Sunday’s poll. An ultraconservative lawyer who vows to