The Bharatiya Janata Party appears set for a victory in four states: Uttar Pradesh, Uttarakhand, Manipur and Goa. In Punjab, though, the Aam Aadmi Party is recording a historic win.What does this mean for national politics? Siddharth Varadarajan speaks to Seema Chishti, Rajesh Mahapatra and Javed Ansari.