Allies and even leaders within have accused Congress strategists of poor floor management, inadequate coordination and a failure to anticipate defections or cross-voting.
BJP has been quick to portray the latest defeat as evidence of the opposition's inability to maintain unity in high-stakes electoral contests.
The setback comes days after another embarrassment for the Congress in Madhya Pradesh, where the Returning Officer rejected the nomination papers of party candidate Meenakshi Natarajan