As Serbians take to the polls again in a rerun of local elections called out as fraudulent back in December, ruling right-wing populists are seeking to cement their already vast hold on power. The vote in Belgrade is being repeated after reports of widespread irregularities last December triggered political tensions and accusations that President Aleksandar Vučić’s Serbian Progressive Party rigged the vote. Populists have denied the accusations but still scheduled a repeat ballot. Also up for grabs on Sunday are more than 80 municipal councils and city halls in two other key cities: the northe…