On May 20, 2015, Mitchell was appointed to the
Executive Council of Prince Edward Island as Minister of Communities, Land and Environment. On January 10, 2018, Mitchell was moved to Minister of Health and Wellness in a cabinet shuffle. From May 8 to September 9, 2019, he served as interim leader of the Liberal Party on Prince Edward Island. On September 3, 2020, he stepped down from his political position as MLA for Charlottetown-Winsloe, after serving in the provincial legislature for thirteen years in both districts. On May 14, 2025, Mitchell announced his bid for the party's
leadership, winning the position on October 3, via defeating Todd Cormier. Mitchell was a candidate in the
2025 Georgetown-Pownal provincial by-election, which he lost to the
Progressive Conservative candidate,
Brendan Curran. ==Electoral history==