[3] He won re-election in 1888, serving a second term representing District 19 in Southern Oregon's Jackson County.
[4] Miller was then appointed as an aide to Oregon Governor Sylvester Pennoyer in the position of Lieutenant-Colonel, serving six years in the post.
[1][2] In 1890, he ran as the Democratic Party candidate for the 52nd United States Congress from Oregon's at-large congressional district.
[6] In 1892, he was a presidential elector for the Democrats, and then from 1893 to 1897 was the registrar at the United States Land Office in Oregon City.
[2] In 1938, Miller was the Democratic candidate in a special United States Senate election to complete the term of Frederick Steiwer, who had resigned.