With just a few days left for the Bihar campaign to end, it remains as enduring a riddle as it was when it had begun. Political parties on both sides are supremely confident of victory. But public opinion - always anecdotal - is clearly divided. This week, inside the constantly shifting tactics and counter-tactics of this high stakes, fiercely contested political battle, on one hand, the Prime Minister has launched a massive but late surge to almost single handedly tilt it in the BJP's favour. And on the other, his former strategists, now crossed sides into the Nitish Kumar camp, are determined to outwit the Modi juggernaut.