Amid uncertainty over a Congress-Aam Aadmi Party alliance in Delhi for the Lok Sabha elections, an internal survey by the Congress could play a key role in changing the minds of state leaders who have been against the arrangement, sources have told NDTV. The survey - which reportedly showed the BJP ahead of both AAP and Congress with 35 per cent of the vote share in the capital - has already been shown to party chief Rahul Gandhi and the Delhi chief Sheila Dikshit.