I support BJP and the nuclear deal. Yes, Singh is strong and doing a good job with this deal but much to my dismay, his economic policies showed the restraint put by the Left parties. I am very disappointed by him. And though Advani certainly cannot fill up the shoes of Vajpai or MMS, left's mere disliking of BJP is reason enough to go with them. Further, when it comes to political opportunism, no party is clean thus what BJP is doing in this situation shouldn't come as a surprise to any of us.
