What remedies are available in the first instance?

SamoaElectoral Act 1963

PARTX ELECTION PETITIONS, 117, p. 101

112. Avoidance of election of candidateguilty of corrupt practice - Where a candidate whohas been elected at any election is proved at the trial of an election petitionto have been guilty of any corrupt practice at the election his or her electionshall be void.

113. Avoidance of election forgeneral corruption - (1) Where it is reported bythe Supreme Court on the trial of an election petition that corrupt or illegalpractices committed in relation to the election for the purpose of promoting orprocuring the election of any candidate thereat have so extensively prevailedthat they may be reasonably supposed to have affected the result, his or herelection, if he or she has been elected, shall be void.

113A. Rolls to be used inby-election when original election avoided - Whereas a result the avoidance of an election pursuant to a decision of the SupremeCourt in respect of an Election Petition it is necessary for a by-election tobe held, and notwithstanding any other provision of this Act, the main roll andsupplementary roll which were used at the election which has been avoided shallbe used at the by-election without any amendment or addition: 

http://www.parliament.gov.ws/images/Electoral_Act_1963_-__Reprint_as_at_2010.pdf