Mayoral front-runner Bill de Blasio stood silently by as celebrity booster Harry Belafonte compared the Tea Party-supporting Koch brothers to the Ku Klux Klan inside a Harlem Church on Sunday — then let the inflammatory attack slide as he spoke to the overflow congregation. De Blasio warmly embraced Belafonte after the liberal icon called the Kochs “white supremacists” and “men of evil,” and repeatedly praised the actor during his own speech from the pulpit of the First Corinthian Baptist Church. Belafonte, 87, viciously tore into billionaire energy moguls and political activists Charles and David Koch as he introduced de Blasio...