Which Maryland politician's retirement made Cardin the senior senator?
Paul Sarbanes
Chris Van Hollen
Barbara Mikulski
Larry Hogan
Answer
Barbara Mikulski, Maryland's first female senator, retired in 2017 after serving for 30 years. This made Ben Cardin, who was elected in 2006, the state's senior senator.
Ben Cardin Quiz: Can You Ace These Tough Questions?