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In page Gender role:

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Even though the number of women running for elected office in the United States has increased over the last decades, they still only make up 20% of U.S. senators, 19.4% of U.S. congressional representatives and 24% of statewide executives.[1] Additionally, many of these political campaigns appear to focus on the aggressiveness of the female candidate which is often still perceived as a masculine trait.[2] Therefore, female candidates are running based on gender-opposing stereotypes because that predicts higher likelihood of success than appearing to be a stereotypical woman.[citation needed]