In 1990, John Major made Patten Chancellor of the Duchy of Lancaster and Chairman of the Conservative Party, with responsibility for organising the Conservative Party's re-election campaign for the upcoming general election. As party chairman, he was widely considered to be the main architect of the somewhat unexpected Conservative victory at the 1992 general election. However, he lost his marginal seat of Bath to the Liberal Democrat candidate Don Foster at that election. Patten's defeat was attributed to factors such as the Poll Tax.