<page_title> 45th United States Congress </page_title> <section_title> Senate </section_title> <table> <cell> Simon Cameron (R) <col_header> Vacator </col_header> </cell> <cell> Resigned March 12, 1877. Successor elected March 20, 1877. <col_header> Reason for change </col_header> </cell> <cell> J. Donald Cameron (R) <col_header> Successor </col_header> </cell> <cell> March 20, 1877 <col_header> Date of successor's formal installation </col_header> </cell> </table>
Simon Cameron (R) was until March 12, 1877, and J. Donald Cameron (R) succeeded from March 20, 1877.