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Representatives and Senators: Trends in Member Characteristics Since 1945

Published Jan 27, 2014Updated Jun 20, 2025

The Congressional Research Service is a nonpartisan policy and legal analysis arm of the Library of Congress. CRS reports are written for members of Congress and their staff, not the public — but they’re made available openly through Congress.gov.

Representatives and Senators: Trends in Member Characteristics Since 1945 — Informed