From 1789 to 1801 Langdon joined the Federal Senate, serving as the first Provisional President in many meetings. During these years, his political views changed. A supporter of a strong central government and former member of the Federal Party, he later objected to the terms of the Jay Treaty (1794). By 1801, he completely turned to support the Republican – Democratic side of Jeffeson. Just a nurse who loves dog poster. That same year, Langdon refused President Jefferson’s proposal to hold the Navy position, but remained active in New Hampshire politics. He again participated in Parliament between 1801-1805, twice as Chairman. In 1805, he was again elected governor and continued to serve until 1811, with the exception of a one-year hiatus. During that time, in 1805, Dartmouth College awarded him an honorary Doctor of Law degree.