Rita Cosby is losing her year-old MSNBC show and will get her own specials unit for the cable channel effective July 10. The shuffle, which MSNBC announced Thursday, is the first big move of Dan Abrams' three-week tenure as MSNBC's general manager. "Rita Cosby: Live and Direct," which has been telecast at 10 p.m. (ET) weeknights and repeated at 1 a.m. (ET) since late spring, will be replaced by taped documentary programming, under the familiar label of "MSNBC Investigates." Ms. Cosby will serve as the primary anchor of "Investigates," which has been led by various rotating anchors over years. "Investigates"...