KOLKATA: With Mamata Banerjee 's surprise visit to Sonia Gandhi 's residence to greet Congress president on her birthday, the political circles are all abuzz about the new bonhomie between the Congress and Trinamool.Interestingly, Banerjee visited Gandhi's residence after three long years. Even though the senior leaders of both the parties are trying to downplay the incident calling it a normal 'chit-chat' between two "old friends", the meeting has of course, become a talking point in political circles.Mamata Banerjee's rushed meeting with Sonia Gandhi appears to have aimed more at preventing an electoral alli ance between Congress and CPM rather than her own elec toral need here in Bengal TMC, that has earlier commit ted of not disrupting Parlia mentary proceedings, has sup ported Congress and staged a walk out protesting against the court's summon issued to Sonia Gandhi in National Herald case. Political corners are abuzz over Mamata-Sonia meeting claiming the meeting had potential to draw an end to speculation over probable Congress-CPM alliance.There are instances when Banerjee and Gandhi com municated with each other in recent time. In October, both exchanged Diwali wishes and that gave birth to speculation of a new equation.In August, they had a chance encounter at the central hall in Parliament and they hugged. However, the chance communications have not been converted into any polit ical equation as of now. The meeting on Wednesday, how ever, bears more significance than the earlier ones.Veteran Parliamentarian and former speaker, Somnath Chatterjee told ET, "Even though I am not associated with any political party, as an outsider I feel that Mamata Ba nerjee is feeling a bit nervous The nervousness is taking her from this door to that door. In the past three years, she only abused Congress and called them worthless. Suddenly, she overcame all bitterness and is trying to recover the relation ship that she built before 2011 assembly election. Now, be fore 2016 elections, sheap pears to be really desperate."In fact, CPM leaders claim that Banerjee's visit to Delhi is an attempt to repair her relationship with Sonia Gandhi and ink a secret deal with BJP Suryakanta Mishra, state sec retary CPM and a Polit bureau member, said, "She is knocking everybody's door and try ing to bring people closer whom she denounced earlier."Significantly, the sources in TMC ranks said that Banerjee never wanted the alliance be tween Congress and CPM to happen. "This is the reason Didi supported Sonia Gandhi in national Herald case. We also supported them in Parlia ment. BJP is playing similar game with us and Congress The central agencies are after both the parties. This is time when we should join hands Moreover, Didi is trying hard to bring the anti-Modi region al parties together and include Congress in the Grand Alli ance," said a TMC leader.