Horwath led the party through four provincial elections since winning the March 2009 Ontario New Democratic Party leadership election. Under her leadership, the party increased its seat count in the legislature in 2011, 2014, forming Official Opposition in 2018, before losing seats, while remaining Official Opposition, in 2022. Former education critic Marit Stiles was the sole candidate in the contest when nominations closed on December 5. Accordingly, she was acclaimed leader on February 4. The vote was initially expected to be held on March 4, but the NDP provincial council moved the date up to February 4.[4]