For the past decade, women have outpaced men on key measures of college success. They attend college and graduate at higher rates, according to several studies, and they tend to earn higher grades. Yet on many campuses, student government is dominated by men, echoing gender gaps in state and national politics. At the 50 colleges ranked highest by U.S. News & World Report, less than a third of student presidents are women. Three of 12 major colleges in the Washington area have female student presidents: the University of the District of Columbia, Marymount University and Trinity Washington University, where nearly all students are women. The American Student Government Association estimates that 40 percent of student presidents nationwide are female, including those at community colleges. The share is believed to be lower at four-year colleges, though precise figures were unavailable.