Patna, Oct 1 (UNI) A rebellion by Mokama MLA Anant Singh against his own party's candidate in the Bihar MLC elections has triggered a political showdown within the Janata Dal (United), with the JD(U) legislator openly backing a rival candidate from Prashant Kishor's Jan Suraaj Party. Singh is opposing JD(U) candidate and sitting MLC Neeraj Kumar in the Patna Graduates' constituency and has extended his support to Anuj Singh, the Jan Suraaj Party candidate from the same seat. When Anuj Singh filed his nomination on Thursday, Anant Singh also held a roadshow for him in Patna, further intensifying the political…