The 2015 Labour Party deputy leadership election was triggered on 8 May 2015 by the resignation of Harriet Harman as Deputy Leader of the Labour Party of the United Kingdom following the party's defeat at the 2015 General Election. Harman, the Deputy Leader of the Labour Party, became Acting Leader following Leader Ed Miliband's resignation. Harman announced on the same day that she would step down as Deputy Leader, with her resignation taking effect when the new Leader and Deputy Leader are elected. Tom Watson was elected deputy leader with 50.7% of the vote on the third ballot.