SANTIAGO, Chile (AP) — Chileans are voting in a plebiscite to decide whether to adopt a far-reaching new constitution that would fundamentally change the South American country. The proposed charter is intended to replace a constitution imposed by a military dictatorship 41 years ago. For months, opinion polls have shown a clear advantage for the rejection camp, but the difference has been narrowing, giving hope to the document’s supporters that they can pull out a victory on Sunday. A local pollster says that “we are clearly in a situation in which the result will be close.”