The early life of Winston Churchill covers the period from his birth on 30 November 1874 to 31 May 1904 when he formally crossed the floor of the House of Commons, defecting from the Conservative Party to sit as a member of the Liberal Party. Churchill began his political career as a member of the Conservative Party and was first elected as a Member of Parliament (MP), representing the Oldham constituency, on 24 October 1900. Dissatisfaction with Conservative government policy caused him to resign his party membership and join the Liberals in 1904.