Gretchen Whitmer, a former Democratic legislative leader and interim county prosecutor, is running for Michigan governor in 2018.
Whitmer filed the paperwork Tuesday.
She’s the first person to announce her candidacy for the open seat.
Second-term Republican Governor Rick Snyder can’t run again due to term limits.
Another potential Democratic candidate, U.S. Rep. Dan Kildee of Flint Township, says he’ll decide whether to run in coming months.