The winter of 2013 is going to be colder for the Congress. The India Today Group-ORG opinion poll in four states going in for the December verdict predicts a resurgent Bharatiya Janata Party taking all.The survey conducted in Madhya Pradesh, Rajasthan, Chhattisgarh and Delhi (Mizoram, which also goes to vote, has not been covered in this survey) shows that the BJP is reaping the dividends of better investment in leadership.