Nelly Decker: Communications director, House Judiciary Committee Democrats

Nelly Decker is a quintessential under-the-radar staffer who prizes being nearly un-Googleable. But she has nonetheless been a pivotal player in some of Congress’s biggest battles — and will be central in many of the body’s coming clashes should Democrats retake the House. “I have worked in a majority, then minority in Oversight, waged a battle against...