Source: https://www.nytimes.com/2016/01/12/nyregion/alliance-of-2-de-blasio-critics-fosters-speculation-about-mayoral-challenge.html?rref=collection%2Fsectioncollection%2Fnyregion&action=click&contentCollection=nyregion®ion=rank&module=package&version=highlights&contentPlacement=7&pgtype=sectionfront