Nikolić was a member of the far-right Serbian Radical Party (Srpska radikalna stranka, SRS) during his time as an elected official.
He is presumably not the same Srđan Nikolić who served as vice-president of the Assembly of the Community of Municipalities, Autonomous Province of Kosovo and Metohija in 2008 as a member of the SRS.
[4] Nikolić was also the Radical Party's candidate for Ruma's twenty-first division in the 2000 Serbian local elections, which were held concurrently with the Yugoslavian vote.
Nikolić was a vocal opponent of this change, arguing that the new union had been "imposed by the West" as "a plot to dismember Yugoslavia and nourish separatists."
The first members of this body were chosen by indirect election by the republican parliaments of Serbia and Montenegro, with each parliamentary group allowed representation proportional to its numbers.
By virtue of its performance in the election, the Radicals had the right to appoint thirty members to the assembly of Serbia and Montenegro; Nikolić was awarded a new federal mandate on 12 February 2004 and so resigned from the republican parliament.
The Democratic Party (Demokratska stranka, DS) formed a coalition government at the provincial level, and the Radicals served in opposition.
The 2008 local elections in the municipality did not produce a clear winner, and subsequent attempts to form a coalition government were unsuccessful.