Edappadi K Palaniswami; O Panneerselvam (R) CHENNAI: After the rout in the assembly elections, the AIADMK is faced with the challenge of selecting the leader of the opposition. Former chief minister and party joint coordinator Edappadi K Palaniswami has an upper hand in this fight with party coordinator O Panneerselvam as he has the support of a majority of the AIADMK MLAs who have won from western Tamil Nadu. A bigger challenge, however, is that the party must decide on the leader of the opposition by May 11 night. The assembly secretariat on Saturday announced its decision to hold the election for the assembly speaker on May 12.Convention has it that the speaker is officially taken to the chair by the chief minister and the leader of the opposition.