page_title: 90th United States Congress
section_title: Wyoming
hierarchical_section_title: 90th United States Congress / Members / Senate / Wyoming
caption_attribution_description: English: Michael Joseph Mansfield (March 16, 1903 – October 5, 2001) was an American Democratic politician and the longest-serving Majority Leader of the United States Senate, serving the state of Montana from 1961 to 1977
context_page_description: The 90th United States Congress was a meeting of the legislative branch of the United States federal government, composed of the United States Senate and the United States House of Representatives. It met in Washington, D.C., from January 3, 1967, to January 3, 1969, during the last two years of the second administration of U.S. President Lyndon B. Johnson.
  The apportionment of seats in this House of Representatives was based on the Eighteenth Census of the United States in 1960. Both chambers had a Democratic majority.
context_section_description: 1. Gale W. McGee (D)
  2. Clifford Hansen (R)
caption: Senate Majority leader
  Mike Mansfield
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