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There Will Be Mud: Inside the world of opposition research

01:44

The dirt that is slung on the presidential campaign trail is often discovered through the work of opposition research, nicknamed “oppo research.”  From trackers sending video of politicians to stacks of research briefs, enter the war room of oppo research. Willie Geist’s full report, ‘There Will Be Mud,’ airs Wednesday, Mar. 28 at 10 pm/9 c on Rock Center with Brian Williams.