Lets make this straight -Left hasn't done anything all of a sudden. Even though I dont like then even 1%, but I believe that they are the one party which keeps their pricinples/word may how foolish, outdated they are. They have made no secrets of the fact that they will not allow this nuclear deal to go through with their support and they stand by that. And dont be foolish by reading too much into the latest developments - it is just a exit plan worked out between cong and left, way before. Both these outfits cant face voters in the elections WB and Ker as allies. So before the elections they had to get seperated and this was the best political medicine they had.