When President Trump speaks to the March for Life from the Rose Garden Friday — the administration has billed him as “the first sitting president to address the” major antiabortion event “from the White House live via satellite” — it will mark a new chapter in American social conservatism.

Many of the issues that gave rise to the Religious Right have been settled (there is no longer much pushback against gay marriage) or remain stalled even if public opinion polls still capture significant support for socially conservative positions (reinstating school prayer).