See there are different segment of people in india and each and everyone wants something which is beneficial for them. Lord Ram is meant for one particular segment where they now feel that BJP has betrayed them in Mandir issue. Not all voted for BJP because of RAM mandir issue. Atthat time BJP never bothered abt power. Look at now. Even it is finding itself difficult to project any leader for PM post as they are greedy.
Coming to your question, for Congress in Tamil Nadu, they are against Lord Ram and they even not opposing DMK for their derogatory against Lord Ram. They are now in confusion that the n-deal is going to alienate them from muslim.
For DMK,they need muslim votes and they want to show the world that they are secular and for development.If not, they are aligning with congress or BJP, they can't get even a small win in TN. They are now in central govt and they have to defend themselves to muslims that they are all the time with them thro they are with them. They will try to project the hindus that they are for Sethu project and BJP and AIADMK are against that and so the reason to get their votes. If BJP wants power, they have to raise their voice on inter-river connectivity, raising price on essential commedities. I think all get confused.