If the leftist parties were very serious about the deal, they could have stopped it once for all at the beginning itself.They did not do that. Now everything is finalised at Government level both in Inida & USA and the final approval is pending at the Congress. Both the Governments cannot make amendments at this level.The leftists will be ignorant of this fact is highly improbable. They just want to send a political message and make it on record that they were opposed to the deal with USA ; that is all.
I forsee that this is a "LOVERS QUARREL" that will have happy end.