Congress lead UPA cannot pass single bill in parlament without Left MP's support. So whatever things this UPA done it has clear approval of Left parties. But they dont like to take the credit of it, they want to continue fooling their supporters. Communism is a dead idiology. but in india few people who dont use their brain to think why communism is died and why all former communists countries are poorest in the world. Power gready left leaders talk against outside and support inside parlament. But this time Manmohan singh and congress decided to expose left in public, they where enjoying power and same time taking advantage of opposition duty. Do it or die? that is the clear cut message Manmohan singh given to them by daring them to withdraw the support, and clearly stated nuclear deal is a finished one.
Left have to options now, 1. withdraw the support, they will never do! 2. lick & swallow whatever they vomited against the bill.
As usual power gready leaders of all commies shamelessly do the second option.