As her father politically withers away, the Veep gets nervous; could Marcos Jr. be the new Political Center? If you make an existential threat, expect one in return. Popularity can make a president bulletproof. But the specific kind of popularity once -and posssibly, still- enjoyed by Rodrigo R. Duterte has its own built-in paradox. Built as it was, on the ashes of the People Power era, it cannot…