Dragoljub Mićunović , the DOS candidate , performed poorly in the 2003 presidential election and was even beaten by 11 % by Tomislav Nikolić , candidate of the nationalist Serbian Radical Party . Since only 38 % of the electors voted , the presidential election was cancelled for the third time in a row . Therefore , the DOS was disbanded on 18 November 2003 . The disbanding was mostly decided by the Democratic Party , the party founded by the then Prime Minister Zoran Đinđić , who was assassinated on 12 March 2003
was assassinated
Assassination of Zoran Đinđić
Democratic Opposition of Serbia