"@SharadYadavMP Ji congratulations for the event you organised in Delhi. We were glad to be a part of it. Unitedly we will fight for the cause," Banerjee said in a tweet.
Yadav had yesterday rallied about a dozen parties at the convention in New Delhi and asserted that if people stand together, then even "Hitler cannot win".
The convention, titled 'Sanjhi Virasat Bachao' (save the common culture), was attended by Congress vice president Rahul Gandhi and senior leaders from parties like the CPI-M, the CPI, the SP, the BSP, the NCP, the RJD, the NC, the JD-S and the RLD.
The rebel JD(U) leader, who has been removed by Bihar Chief Minister Nitish Kumar as leader of the party in Rajya Sabha, has been insisting that he is the founder of the party and hence the real leader.
As the other opposition leaders called for a united fight at yesterday's programme, Yadav urged the youth and farmers in particular to make right use of their "power of vote" for a bright future.