Congress has realised that this is the perfect time to call for the general election. They have only very few issues in hand (Loan waiver, Nuclear Issue) which are fresh in the mind of the voters. The rise in Prices Pinches. But the real threat will be when the inflation becomes more pronounced. Now, they are blaming the global phenomenon for it. But as the time passes, such a reasoning would not not buy any votes.
BJP can not take any advantage from Nuclear issue. They can neither vehemently oppose it nor support it. Come election, thy will largely ignore it. And, no body will listen to the reasoning of the left, anyway.