" Simply put, we have rarely seen this level of frustration, for this extended period of time, in the history of public opinion polling." So says the latest Greenberg Quinlan Rosner Research memo, titled "A New America: Unmarrieds Drive Political and Social Change." The memo's authors write:

Politically, unmarried women drive the mood for change in this country. Seventy-eight percent of the cohort believes the country is on the wrong track. Unmarried women changed Congress in 2006, giving 66 percent of their vote to Democrats. In our latest poll, they give Hillary Clinton 66 [percent] for president. Unmarried women have the potential to emerge as the 'Democrats' Evangelicals.'

This suggests why the Clinton campaign's message of the day has been that Clinton's male opponents are "ganging up" on her. If Clinton were to lose support from unmarried females - who may be sympathetic to such appeals - her chances of winning the Democratic primary would fade.