This is because Hindu's editor is closely related to Karunanidhi's family and thats the reason they do like this.
Next time, when DMK has allies with BJP, the same editorial will project Sonia as Demon.
Its all very common for media to go along with ruling party for Money. Tejpal of Tehelka failed miserably doing a sting operation. He would have got crores of rupees.
Now with newsprint & other expenses going up, these media people do need to rely on ruling party for monetory purpose.
