FOX News Channel posted an increase last month in its total day viewership compared to April 2011, according to Nielsen. "America Live With Megyn Kelly" saw increases of 30 percent for the 1 p.m. hour and 35 percent for the 2 p.m. hour in the key 25-54 age group. "Happening Now" was up 34 percent, and "Studio B With Shepard Smith" was up 32 percent among the same demographic. FOX also claimed...