By Jeff Zeleny, CNN(CNN) — Sen. Amy Klobuchar launched a Democratic bid for governor on Thursday, pledging to unify her state and move beyond a deadly battle with the federal government over immigration. Tim Walz ended his reelection bid in the wake of a deepening federal investigation into widespread fraud of social service programs in Minnesota. Klobuchar began considering jumping into the governor’s race long before unrest rocked Minnesota in the wake of Good’s death and intensified after Pretti was killed. In the race for Minnesota governor, a crowded GOP field is already engaged in a competitive primary including Lisa Demuth, the speaker of the Minnesota House and highest-ranking Republican in the state. “I don’t like fraud or waste in government – that’s why I went after crime as county attorney,” Klobuchar said.