If you think like a head of an International business who wants the deal to be done, you will understand.
Here is the take: First lure BJP into the game and have them initiate the deal since majority of the local Nuclear clout is with them and you can't even get the Government officials the think about this deal without BJP's blessing.
Then, make sure they are out of power because they will have a upper hand in the deal making process.
Get some other government that is vulnerable and has the mind set of rich and hipocratic views so that very few (cabinet) can be convinced that they are getting everything for a basket of Mangoes.
Then spank them with no trust vote if they ask for more.
Finally, get all these guys out and place a completely new bunch of parties with regional priorities and get the contract for cheap because most of them don't even ask for a kick-back and all they want is a temple here and a Mosque there or let them out of some curruption charges that they were not part of.
And all this can be done when you have a beverage distribution center in every village in India.