In British politics, Middle England is considered as a grouping to be especially important because of its potential to swing the results of United Kingdom general elections; according to the polling company MORI, Middle England is said to make up 25% of the UK population, its members are not devoted to any particular party and may be swayed by successful political campaigning, and many live in marginal constituencies. Middle England was also considered to be a major force in the vote to leave the European Union during the 2016 European Union membership referendum.