When Women Run Against Women: The Hidden Influence of Female Incumbents in Elections to the U.S. House of Representatives, 1956–2002

Although it is well known that “when women run, they win as often as men,” the literature on women and campaigns suggests that we should see significant differences in races involving male and female incumbents. Do female incumbents face the same competitive environment as their male counterparts in elections for the U.S. House of Representatives? Using the existing literature on the role of stereotypes and gender traits in campaigns, we formulate two hypotheses to explain the relationship between gender and incumbency. The Competition Hypothesis asserts that compared to male incumbents, women running for reelection will face more competition in retaining their seats. The Gender Effect Hypothesis predicts that female incumbents will induce other women to enter the race. On the basis of an analysis of House elections from 1956 to 2002, we find considerable support for both hypotheses. In House elections, female incumbents have a “hidden influence”: Not only do they face more competition but they also increase the participation of female candidates in their own party as well as the opposition party. Although female incumbents win at the same rates as male incumbents, they face a much more competitive environment.