Paraguay ? Former Roman Catholic bishop Fernando Lugo won a historic victory in Paraguay’s presidential election Sunday, ending more than six decades of one-party rule with a mandate to help the nation’s poor and indigenous.

His rival, Blanca Ovelar, conceded defeat after a closely fought race to lead this poor, agrarian nation where Ovelar’s Colorado Party is the only ruling party most people have ever known.

News of the win by Lugo, dubbed the “bishop of the poor,” set off massive parties in cities across Paraguay with horn-honking caravans of cars blaring music. Others stamped on torn-down banners of the Colorado Party, which many Paraguayans blame for decades of corruption by political elites.

The triumph by Lugo’s eclectic opposition alliance also marked the latest in a series of election wins by leftist, or center-left, leaders in South America.

“I invite Paraguayans of all political types, even the ones who don’t share our ideals, to help this country that was once great be great again,” Lugo said.

Officials said 66 percent of the electorate cast ballots, a record number in a presidential election since the 1989 restoration of democracy.