Chennai, June 9 (UNI) Filing of nominations for the June 19 biennial elections to the Rajya Sabha from the Tamil Nadu Assembly ended on Monday and all the six official candidates--three from the ruling DMK, one from its ally, the MNM of actor-politician Kamal Haasan and two from the principal Opposition AIADMK--are set to be elected unopposed on June 12 after the last date for withdrawals, though 13 candidates have filed entered the fray.