A day after senior Congress leader D K Shivakumar questioned the contribution made by Rajeev Chandrasekhar to the development of Kerala, the BJP leader on Wednesday hit back by saying he does not need the certificate of a "corrupt" politician who is out on bail. Chandrasekhar, who is facing off against Congress' Shashi Tharoor in the Thiruvananthapuram Lok Sabha constituency, said ever since he began his poll campaign, he has stated what he will do if he wins and will follow through on that. He further said in the next couple of days he would be releasing a vision document on bringing development and investment to the southern state. "Once I become an MP and a minister from here, for the next five years I will work to implement that vision document," Chandrasekhar, also the Union Minister of State for Information Technology and Electronics, told a TV channel. Regarding comments by Karnataka Deputy Chief Minister Shivakumar against him, Chandrasekhar said everyone knows the Congress