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In page United States Congress:

"

Racially polarized voting, racial stereotypes and lack of institutional support still prevent women of color from reaching Congress as easily as white people. Senate elections, which require victories in statewide electorates, have been particularly difficult for women of color.[6] Carol Moseley Braun became the first woman of color to reach the Senate in 1993. The second, Mazie Hirono, won in 2013.[citation needed]