MONTEVIDEO — Uruguay’s leftist opposition candidate, Yamandú Orsi, became the country’s new president in a tight runoff Sunday, ousting the conservative governing coalition and making the South American nation the latest to rebuke the incumbent party in a year of landmark elections worldwide. Even as the vote count continued, Álvaro Delgado, the presidential candidate for the center-right ruling coalition, conceded defeat to his challenger while surrounded by sullen-looking family members and colleagues. [time-brightcove not-tgx=”true”] “The country of liberty, equality and fraternity has triumphed once again,” Orsi said to sprawling crowds of supporters that waved flags and shouted their support.