Chelsea Clinton, who’s not yet in NBC’s heavyweight class, steps into the ring at the Downtown Boxing Gym on St. Aubin for an upcoming “Nightly News” feature. She posts this top snap at Facebook from Friday’s taping of a “Making a Difference” segment about its nonprofit youth program for boys and girls. Eric Lacy this weekend broke news of the visit at MLive, quoting a producer who says the segment could air as soon as Feb. 2 or 3…
