WASHINGTON — With the unveiling here Monday at the National Portrait Gallery of the official presidential likenesses of Barack Obama and the former first lady, Michelle Obama, this city of myriad monuments gets a couple of new ones, each radiating, in its different way, gravitas (his) and glam (hers).

Ordinarily, the event would pass barely noticed in the worlds of politics and art. Yes, the Portrait Gallery, part of the Smithsonian Institution, owns the only readily accessible complete collection of presidential likenesses. But recently commissioned additions to the collection have been so undistinguished that the tradition of installing a new portrait after a leader has left office is now little more than ceremonial routine.

The present debut is strikingly different. Not only are the Obamas the first African-American presidential couple to be enshrined in the collection. The painters they’ve picked to portray them — Kehinde Wiley, for Mr. Obama’s portrait; Amy Sherald, for Mrs. Obama — are African-American as well. Both artists have addressed the politics of race consistently in their past work, and both have done so in subtly savvy ways in these new commissions. Mr. Wiley depicts Mr. Obama not as a self-assured, standard-issue bureaucrat, but as an alert and troubled thinker. Ms. Sherald’s image of Mrs. Obama overemphasizes an element of couturial spectacle, but also projects a rock-solid cool.

[Read our interview Kehinde Wiley | Read our interview with Amy Sherald]

It doesn’t take #BlackLivesMatter consciousness to see the significance of this racial lineup within the national story as told by the Portrait Gallery. Some of the earliest presidents represented — George Washington, Thomas Jefferson — were slaveholders; Mrs. Obama’s great-great grandparents were slaves. And today we’re seeing more and more evidence that the social gains of the civil rights, and Black Power, and Obama eras are, with a vengeance, being rolled back.