Executive director of the Cyrus Network Hasan Nasbi said the Indonesian Democratic Party of Struggle (PDI-P) was unlikely to garner 30 percent of the vote as promised.
He said the party's legislative hopefuls had failed to leave a lasting impression with potential voters.
"Many hopefuls thought that banners picturing them with Jokowi would be enough. Well, it's not," Hasbi told a press conference held at the Centre for Strategic and International Studies (CSIS) building in Jakarta on Wednesday.
Nowadays, he said, the public demanded more: Real work and proven-track records.
He then suggested PDI-P evaluate whether the 'Jokowi effect' had benefited them or if it had bred complacency in its candidates.
Political researcher Phillips J Vermonte of the CSIS denied the urgency to reevaluate party members.
"The more important thing to do is mull the right partner to run the show for the next five years," he said.
The PDI-P have been ranked first, with 19.26 percent of votes, by the CSIS-Cyrus Network joint-exit poll survey. Behind the PDI-P was the Golkar Party, with 12.86 percent; and the Gerindra Party with 10.26 percent. The ruling Democratic Party was in fourth with 7.70 percent.
The exit poll was conducted in 2,000 polling stations in 33 provinces with 8,000 respondents. The survey's confidence level was 95 percent with margin of error +/- 1.1 percent.