It is precisely the reason the founding fathers of the Indian Constitution, had laid down an unwritten rule that the Prime Minister should be a direct elect by the people to accord legitimacy to the GOvt he or she heads.
Acutally, it is the Governing principle of any Democracy of any type, Presidential or Parliamentary!
Had the PM been the direct elect perhaps it would have been easier for him to defend allegations like CIA mole etc., perhaps these allegations are right and perhaps they are baseless!
As a matter of fact, COngress and the NDA have more in common than the COngress & LEft or NDA & Left combos.
I personally prefer the leftists taking over power, a wishful thinking it might be given their numbers or to be precise the lack of them!