THERE is more than a touch of irony to the way in which political pundits are today vying with each other to predict a Congress revival under Sonia Gandhi's leadership. It is these same worthies who had not so long ago appeared so confident that she would lead the party to disaster. Indeed, analysts who are constantly mocking politicians for abruptly switching to the winning side are themselves as adept in clambering on to the bandwagon of success.