Following is a thought-provoking excerpt from a long article in Rolling Stone:

By the eve of 2016, evidence of a profound social and cultural revolution begun decades ago became too strong to ignore. The rise of the Internet, changing patterns in immigration, racial and ethnic diversity, family organization and gender roles, as well as declining religious piety, have created an America unimaginable when Clinton and Gingrich squared off 20 years ago. 

According to data reported by the respected Democratic pollster Stanley B. Greenberg, a majority of U.S. households are now headed by unmarried people; non-religious seculars outnumber Protestants; and two-thirds of women are either the breadwinners or co-breadwinners of their households. Racial minorities now constitute nearly 40 percent of the nation's population. According to one Gallup Poll, 60 percent to 70 percent of Americans consider homosexual relations, out-of-wedlock births and divorce as "morally acceptable."

Even more striking, according to Greenberg, the electorate has changed as well. In 2012, the combined numbers of minorities, single women, millennials and seculars formed 51 percent of the nation's voters. In 2016, Greenberg's analysis shows, these same groups will form 63 percent of the electorate. As each of these groups supports Hillary Clinton for president by margins of two to one, Greenberg writes, "It is fair to say that the United States has reached an electoral tipping point."