In Mizoram's lone Lok Sabha constituency, it will be a triangular fight between incumbent member C.L. Ruala of the Congress, Robert Romawia Royte of the United Democratic Front (UDF) and M. Lalmanzuala of the Aam Aadmi Party.
The main opposition UDF is an alliance of eight parties led by the Mizo National Front (MNF), which ruled the state for two terms (1998-2003 and 2003-2008). The UDF is supported by the Bharatiya Janata Party (BJP).
The MNF had won the Lok Sabha seat, reserved for tribals, in 2004.
The by-election for the Hrangturzo assembly seat would also be held Friday.
The by-election was necessitated after Chief Minister Lal Thanhawla, who won from two constituencies in the assembly polls held Nov 25, vacated the seat.