The re-emergence of Sonia Gandhi on the front lines of the Congress' battles has renewed speculation about the possible return of her son and party vice-president Rahul Gandhi to Delhi's political theatre. On Tuesday, when the Opposition marched from Parliament House to Rashtrapati Bhavan to protest against what it called an "anti-farmer" land acquisition Bill, it was Sonia Gandhi who led the contingent of senior leaders cutting across party lines. Again, when Trinamool Congress spokesperson Derek O' Brien tripped after being jostled in the ensuing melee, it was the Congress President who extended a hand and helped him get back on his feet. Only a few days back, she had surprised party members with her brisk march down Akbar Road to show solidarity with former prime minister Manmohan Singh, after he was summoned in connection with the coal block allocation scam.