Miller worked as secretary to U.S. Representative
William H. Heald from 1910 until 1912, and during this period studied law in
Washington, D.C. He was appointed by his father, Governor Charles R. Miller, to the position of
Delaware Secretary of State from 1913 until 1915. Miller was elected to the
United States House of Representatives in 1914, defeating incumbent Democratic U.S. Representative
Franklin Brockson. During this term, he served in the Republican minority in the
64th Congress. Seeking reelection in 1916, he lost to Democrat
Albert F. Polk, a lawyer from
Georgetown. Miller served from March 4, 1915, until March 3, 1917, during the administration of U.S. President
Woodrow Wilson. ==World War I==