We explore the reasons for the unexpected defeat of Winston Churchill's Conservatives by Labour in the British general election of 1945. Was the outcome a result of Churchill's election campaign errors, as many have supposed, or did the coming-of-age of a new political generation make it a foregone conclusion? Much controversy in the partisanship literature centres on whether electoral realignments result primarily from conversion of existing voters or from mobilization of previously non-voting individuals. In particular, the 1930s US realignment has been the focus of considerable debate. In this article we shed new light on realignment processes by examining the 1945 British realignment that brought the Labour party to power. We find that, in this more straightforward case, the critical impetus came from new voters rather than from converts. Our findings raise questions that need to be confronted in the analysis of other realignments, such as that accompanying the American New Deal. They also shed new light on a much-interpreted episode in British electoral history.
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