KERALA Congress alone can form stable government : Sonia April 09 , 2009 00:00 IST A A A Campaign in full swing : Thiruvananthapuram DCC president V.S. Sivakumar , senior leader K. Karunakaran , deputy leader of the Opposition G. Karthikeyan , UDF candidates in Attingal and Thiruvananthapuram G. Balachandran and Shashi Tharoor , Congress president Sonia Gandhi and Leader of the Opposition Oommen Chandy at a UDF election meeting in the city on Wednesday evening .