But there may be something else at work: Research points to a substantial gender gap in the way women and men approach running for office. Women have different reasons for running, are more reluctant to do so and, because there are so few of them in politics, are acutely aware of the scrutiny they draw — all of which seems to lead to differences in the way they handle their jobs once elected.

“The shorthand of it is that women run for office to do something, and men run for office to be somebody,” said Debbie Walsh, director of the Center for American Women and Politics at Rutgers University. “Women run because there is some public issue that they care about, some change they want to make, some issue that is a priority for them, and men tend to run for office because they see this as a career path.”

Studies show that women are less likely to run for office; it is more difficult to recruit them, even when they have the same professional and educational qualifications as men. Men who run for office tend to look at people already elected “and say, ‘I’m as good as that,’ ” said Jennifer Lawless, director of the Women and Politics Institute at American University here. “Women hold themselves up to this hypothetical standard no candidate has ever achieved.”