Back in the early days of GetReligion (we launched on Feb. 2, 2004) I urged reporters not to forget the old Religious Left and, when covering believers in those flocks, not to forget that there is more to their stories than politics. The left is the left because of doctrinal and worship traditions, as well as convictions that align with the New York Times editorial page.

Then something happened that modified my thinking on this subject. Hang in there with me, because I am working my way to an interesting think piece, care of Religion Dispatches. The headline: “The Inauguration’s Beautiful Call for Unity Was Undermined by the Invocation of Religion.”

Faithful readers of GetReligion will remember that, in the summer of 2007, political scientist and polling maven John C. Green spoke at a Washington Journalism Center seminar to a international circle of journalists who came to Capitol Hill to discuss press freedoms in their homelands. But the hot topic of the day was the rise of Sen. Barack Obama of Illinois and whether he could reach the White House. As I wrote in a previous post about that:

The bottom line: Obama was speaking directly to Democrats in the black church, but he was also reaching out to an emerging power bloc in his party — a group Green called the “religiously unaffiliated.” These so-called “nones” were poised to form a powerful coalition with atheists, agnostics and liberal believers.

Green made a prediction that was years ahead of schedule, in terms of the conventional thinking of Beltway politicos. At some point in the future, that growing coalition of secularists and religious liberals was going to cause tensions inside the Democratic Party.

Five years later, when the Pew Forum released its groundbreaking report on religiously unaffiliated Americans, Green raised that issue once again in a public event. Here’s a bite of the “On Religion” column that I wrote at that time.

[The] unaffiliated overwhelmingly reject ancient doctrines on sexuality with 73 percent backing same-sex marriage and 72 percent saying abortion should be legal in all, or most, cases. Thus, the "Nones" skew heavily Democratic as voters — with 75 percent supporting Barack Obama in 2008. The unaffiliated are now a stronger presence in the Democratic Party than African-American Protestants, white mainline Protestants or white Catholics.

"It may very well be that in the future the unaffiliated vote will be as important to the Democrats as the traditionally religious are to the Republican Party,” said Green, addressing the religion reporters. "If these trends continue, we are likely to see even sharper divisions between the political parties."

This brings us to Biden, today’s Democratic Party and some of the challenges he faces, when dealing with moral, cultural and religious issues in American life.