A vast literature debates whether demographic diversity in Congress enhances representation.

Through FOIA requests, we analyzed 80,000 communications between members of the U.S. Senate and House (108th-113th Congresses) and federal agencies to reveal how these interactions reflect legislative advocacy.

Our findings show that descriptive representatives—specifically women, racial/ethnic minorities, and veterans—are significantly more likely to champion legislative causes aligned with their demographic group's priorities.

This discovery challenges conventional wisdom by demonstrating shared identity as a powerful representation mechanism independent of partisan alignment or political consensus. Contrary to expectations, our results indicate that substantive advocacy occurs even amidst deep ideological divides.

Implications include the potential for diverse perspectives within Congress to enhance democratic responsiveness and provide clearer pathways for studying how lived experiences shape policy advocacy.