It’s bizarre that a terrorist-loving, America-hating Florida grad student is a top contender for a New York City House seat, but Darializa Avila Chevalier’s success exposes how flabby, complacent and value-free the mainstream local Democratic Party has grown in its uncompetitive echo chamber. Why is Rep. Adriano Espaillat’s campaign floundering, when by usual measures he’s done everything right? A reliable progressive and go-along pol, one who smoothly plays the game of urban ethnopolitics,