The resignation of incumbent assemblyperson Mohammad Fairus Khairuddin has not gone down well with many Penanti voters.
They are unconvinced that the resignation was justifiable and necessary to pave way for another by-election, the sixth in country since the 12th general election last year.
PKR now faces a big test to convince these doubtful constituents that Fairus made the right decision to quit, thus necessitating the by-election.
The party also needs to disseminate information to convince the sceptical Penanti constituents, many whom feel that PKR and Pakatan state government leadership had betrayed Fairus.
It's not going to be easy for PKR since some 30 percent of Penanti's 15,241 electorates, including PKR and PAS members, are said to be unhappy with the way the Fairus saga was handled.
The voters feel both PKR and Pakatan government leaders should have given Fairus more protection when the former DCM 1 was under attack from forces within the party.
This spells trouble for PKR since Umno too has a strong presence in the constituency.The 30 percent sceptical electorates are the decisive voters in the by-election.
PKR and PAS each has some 3,000 members in the area, while Umno has some 6,000 members.