A video of DMK leader Dayanidhi Maran, which party sources claim is old, can spell trouble for the unity of INDIA bloc at a time when it is gearing up for the big Lok Sabha contest just a few months away. In a video, the authenticity of which NDTV cannot verify, DMK MP Dayanidhi Maran is heard comparing the job prospects of those who have studied only Hindi with those who know English. In this context, he says those who study only Hindi in Bihar "build houses" and "clean toilets" in Tamil Nadu.