John Liu thought 2013 would be the year he was elected New York City’s next mayor. He ran, but a federal investigation overshadowed his campaign and he came in a distant fourth. This year he’s running again, for a smaller seat. And he says the political winds have changed. Liu is trying to get back in the game as one of a group of Democrats running primaries against the former so-called “Independent Democrats” who’ve helped Republicans keep control of the state Senate. Have the stars aligned for his return?