Thrown with éclat into the opposition, especially from 1732, the time when he had to cease his court duties, Lord Chesterfield worked with all his might for ten years for the downfall of Walpole, which did not take place until 1742. But even then he inherited none of his power, and he remained out of the new ministries. When two years afterward, in 1744, he became one of the administration, first as ambassador to The Hague and Viceroy of Ireland, then as Secretary of State and member of the Cabinet (1746-1748), the honor was more nominal than real. In a word, Lord Chesterfield, at all times a noted politician in his own country, whether as one of the chiefs of the opposition, or as a clever diplomatist, was never a powerful, or even a very influential, minister.
In politics he certainly possessed that far-sightedness and those glimpses into the future which belong to very wide intelligence, but he possessed those qualities to a much greater degree than the patient perseverance and constant practical firmness that are so necessary to the members of a government. It may truly be said of him, as of Rochefoucauld, that politics served to make an accomplished moralist of the imperfect man of action.
In 1744, when he was only fifty years of age, his political ambition, seemed, in part, to have died out,
