The authors predict Judge Gorsuch, a federal appeals court judge in Denver, would be a reliable conservative, “voting to limit gay rights, uphold restrictions on abortion and invalidate affirmative action programs.”

Should he be confirmed, the court will return to a familiar dynamic, with Justice Anthony M. Kennedy holding the decisive vote in many closely divided cases.

“He’s probably one of the least likely to drift once he got on the court,” Ms. Epstein said of Judge Gorsuch.