Kathleen McCartney, president of Smith College, writes: One week after the election, many students on my campus, one of the nation’s largest women’s colleges, remain heartbroken that Hillary Clinton was not able to shatter, in her words, “the highest, hardest glass ceiling.” Many people have attributed Mrs. Clinton’s loss to her actions in public life, or to an America that wanted “change” at any cost. But this loss is as much about sexism as anything else.