MSNBC host Rachel Maddow announced Monday that she will be taking a hiatus after Thursday’s show until April. She is taking the time off to focus on co-producing Bag Man, a movie based on her book and podcast about President Richard Nixon‘s disgraced Vice President Spiro Agnew. The movie will be directed by Ben Stiller and produced by Saturday Night Live executive producer Lorne Michaels. She also announced that she will be working on a new podcast in the next couple of months for NBC Universal. “I am super excited to tell you about it when I have more to tell,” said Maddow. She made the annou…