If ever there were a stress test for the uneasy relationship between the Congress and the DMK, it is this. Kanimozhi, the daughter of DMK Chief M Karunanidhi, has today been named by the CBI as a co-conspirator with A Raja in the 2G scam. However, Mr Karunanidhi's wife, Dayalu Ammal, does not feature in the new chargesheet filed by the CBI in a Delhi court today. The concession, sources say, is a result of political pressure though it will formally be attributed to a lack of evidence.