<page_title> 37th United States Congress </page_title> <section_title> Senate </section_title> <table> <cell> James M. Mason (D) <col_header> Vacator </col_header> </cell> <cell> Expelled March 28, 1861, for supporting the rebellion. Successor was elected. <col_header> Reason for change </col_header> </cell> <cell> Waitman T. Willey (U) <col_header> Successor </col_header> </cell> <cell> July 9, 1861 <col_header> Date of successor's formal installation </col_header> </cell> </table>
James M. Mason (D), until March 28, 1861 and Waitman T. Willey (U), from July 9, 1861.