or the last 20 years, Anderson Cooper, CNN’s marquee news anchor, has emceed a live New Year’s Eve special from Times Square. If you’ve watched, you know that Cooper — a nondrinker on any other day — careens through the shows in a state of giddy semi-sobriety, sharing out-of-school tales about celebs, guffawing at his co-hosts’ irreverent wisecracks, and generally struggling to