[1] He was a provincial cabinet minister for three years and on two occasions served as the leader of the Liberal Party in the Legislative Assembly of Manitoba.
The party won only nine seats, but Mickle scored a surprisingly easy victory (584 votes to 293)[4] over Conservative John Leich.
When Greenway re-entered federal politics in 1904,[3] Mickle was chosen to replace him as parliamentary leader.
[1] Mickle served as the de facto party leader until March 28, 1906, when a provincial Liberal convention acclaimed Edward Brown for the position.
Brown was unable to win a seat in the election which followed, and Mickle was again chosen as parliamentary leader in January 1908.