Who were the top two candidates for the Chilean presidency in 2010 ?
Chilean politics is dominated by two main coalitions : the center - left Concert of Parties for Democracy ( " Concertación de Partidos por la Democracia " ) , composed of the Christian Democrat Party , the Socialist Party , the Party for Democracy , and the Social Democrat Radical Party ; and the center - right Alliance for Chile ( " Alianza por Chile " ) , composed of the Independent Democratic Union and National Renewal .