He won the presidency, but Radical Party's Nikolic will probably still be influential.
Serbs vote Sunday in polls in which Kosovo independence is a central issue. Slovenia was once part of Yugoslavia.
The Radical Party acting leader Nikolic got 39 percent of the vote in presidential polls Sunday. He and pro-European moderate Tadic will square off in Round 2 of voting on Feb. 3.
Presidential polls take place Sunday amid intense debate that has pitted hard-line nationalists against more moderate politicians.
Soldiers find major weapons caches, a bunker, and an insurgent expense report in Diyala Province.