Whitmer was born and raised in Michigan. She is a graduate of Forest Hills Central High School near Grand Rapids, Michigan State University, and the Michigan State University College of Law. She ran unsuccessfully for the state house in the 1990s before being elected in 2000. In 2006, she became a state senator, a position she kept until term limits forced her to step down in 2015. She was the Senate's first female Democratic leader from 2011 to 2015. In 2013, Whitmer gained national attention for a floor speech during a debate on abortion in which she shared her experience of being sexually assaulted. For six months in 2016, she was the county prosecutor for Ingham County.