Congress leader and sitting MP Shashi Tharoor filed his nomination today as a UDF candidate in Thiruvananthapuram  Lok Sabha constituency in Kerala. Mr.Tharoor submitted his nomination at the district collectorate this afternoon accompanied by senior party leaders and other party workers. The NDA candidate and Union Minister of State, Rajeev Chandrasekhar, is scheduled to file his nomination tomorrow. Meanwhile, the LDF candidate, Pannyan Raveendran, submitted his nomination yesterday. Meanwhile, the election campaign on all three fronts is in full swing in the State as the date of filing of nomination ends tomorrow.