That was speedy. Rosemarie DeWitt departed The Newsroom’s second season last week, citing scheduling issues, and now actress Marcia Gay Harden is taking over. She’ll play Rebecca Halliday, a litigator tasked with defending Will McAvoy’s Atlantis Cable News in a wrongful-termination lawsuit. Harden’s recent TV credits include Damages, Body of Proof, Law & Order: SVU, and Royal Pains.