Congress President Sonia Gandhi is not "invincible" in her Rae Bareli constituency, senior BJP leader and former union minister Sumitra Mahajan claimed on Thursday.Mahajan, who recently toured Rae Bareli to evaluate the possibilities for the BJP on the seat in the next Lok Sabha elections, said her party would launch a movement to highlight the "unfulfilled promises" of Gandhi and work among people to bring them into the party fold."Sonia Gandhi has not done anything great for her constituency and the people there are aware of this fact," she said.Mahajan has also been asked by the BJP to visit Mohanlalganj and Barabanki consatituencies to evaluate party's electoral prospects there.To a question, she said that the final decision on Atal Bihari Vajpayee seeking reelection from Lucknow would be taken by the veteran leader himself.