Šulkić ran as the DSS's candidate in Velika Plana and was elected in the second round of voting.
Šulkić led the DSS to victories in Velika Plana in the 2008 and 2012 local elections and was in both cases confirmed for a new term as mayor afterward.
In leaving office, Šulkić took credit for careful financial management over the previous eleven years.
Serbia's electoral system was reformed in 2011, such that parliamentary mandates were awarded to candidates on successful lists in numerical order.
The DSS experienced a serious split in late 2016, following which Šulkić, Gorica Gajić, and Milan Lapčević were the only delegates in the national assembly to remain with the party; as five members are needed to form a parliamentary group, all served as independents.
[16] He articulated several criticisms of Serbia's parliamentary culture, and what he described as the loss of democratic freedoms under Aleksandar Vučić's rule, in a 2020 interview with Danas.
[17] The DSS formed an electoral alliance called METLA 2020 in late 2019, and Šulkić received the fourth position on its list in the 2020 parliamentary election.
He was also appointed as a deputy member of Serbia's delegation to the Parliamentary Assembly of the Council of Europe (PACE), where he was an alternate on the committee on migration, refugees, and displaced persons.