The observers are slated to elicit the MLAs' views on the leadership issue in Karnataka where the party was swept to power with comfortable majority of 121 seats in the 224-member Assembly.
"Senior minister A K Antony, AICC general secretary in-charge of the state Madhusudan Mistri, Luizinho Faleiro, who was Karnatataka's screening committee chairman, and Union Minister Jitender Singh are going as AICC observers to Karnataka tomorrow," party general secretary Janardan Dwivedi told PTI in New Delhi.
The name of Union Oil Minister M Veerappa Moily is also making the rounds.
The shock defeat of Karnataka Pradesh Congress Committee chief G Parameshwara is believed to have weakened his stake for chief ministership, party sources said.
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Contenders sought to vigorously push their claims. Siddaramaiah's Bangalore residence was a hub of activity today as several MLAs loyal to him thronged it.
"The High Command will decide (on the Chief Ministership)", Siddaramaiah and Kharge said separately.
Kharge is a seasoned politician and had served as Karnataka Pradesh Congress Committee President and Leader of Opposition.
More people have thrown their hats in the ring. They include former KPCC President R V Deshapande, former Working President of KPCC D K Shivakumar, senior Lingayat leader Shyamanur Shivashankarappa and T B Jayachandra who served as Deputy Floor Leader of Congress in the outgoing Assembly.