Republican Simon Cameron was elected to the United States Senate by the Pennsylvania General Assembly, consisting of the House of Representatives and the Senate, in 1867 and was re-elected in 1873. Sen. Cameron resigned on March 12, 1877.
Following the resignation of Sen. Simon Cameron, the Pennsylvania General Assembly convened on March 20, 1877, to elect a new Senator to fill the vacancy. Former United States Secretary of War J. Donald Cameron, Simon Cameron's son, was elected to complete his father's term, set to expire on March 4, 1879. The results of the vote of both houses combined are as follows:
|Republican||J. Donald Cameron||147||58.57|
|Democratic||Andrew H. Dill||92||36.65|
|Democratic||Andrew G. Curtin||1||0.40|
- "U.S. Senate Election - 20 March 1877" (PDF). Wilkes University. Retrieved 22 December 2013.
- "CAMERON, Simon, (1799 - 1889)". Biographical Directory of the United States Congress. Retrieved 22 December 2013.
- "CAMERON, James Donald, (1833 - 1918)". Biographical Directory of the United States Congress. Retrieved 22 December 2013.