Montana Attorney General Steve Bullock will enter the race to be the state's next governor with a speech to supporters in Billings on Wednesday.

That's according to two people close to the Democrat; one person involved in his campaign and another who is a top Bullock adviser. The two spoke on the condition of anonymity because they weren't authorized to speak publicly before the announcement.

The 45-year-old Bullock will attempt to succeed Gov. Brian Schweitzer, a Democrat who has enjoyed immense popularity in a state that leans conservative. Schweitzer can't run for re-election because of term limits.

Bullock has served for less than one term as attorney general. He has raised about $200,000 in his re-election effort, money that can be transferred to the governor's race.

The Republican front-runner for governor is former congressman Rick Hill.

Associated Press