Hmmm. Going over the list of Chief Justices of the Supreme Court, and we find…
John Jay: experience as a lawyer and as Secretary of State, no judicial experience.
Oliver Ellsworth: Connecticut’s State Attorney for eight years, then a senator. No judicial experience.
John Marshall: Lawyer, Virginia State Delegate, Congressman. No judicial experience.
Roger Taney: Lawyer, Attorney General of Maryland, Attorney General of the United States. No judicial experience.
Salmon Chase: Lawyer, Senator, Governor of Ohio. No judicial experience.
Morrison Waite: Lawyer, Ohio State Senator. No judicial experience, though his father was a judge.
Melville Fuller: Lawyer, member of the Illinois House of Representatives. No judicial experience.
Edward White: Lawyer, Associate Justice in the Supreme Court of Lousiana for less than two years, Senator.
Okay, so I’m up to Chief Justices from 1789 to 1921, and they all together have less judicial experience than Roberts.
William Howard Taft: Federal Judge for the Sixth Court of Appeals.
Charles Evans Hughes: Lawyer, Governor of New York. No judicial experience.
Harlan Stone: Lawyer, Attorney General of the United States. No judicial experience.
Frederick Vinson: Lawyer, Commonwealth Attorney for Kentucky. Five years on the Federal Bench.
Earl Warren: Lawyer, District Attorney for San Francisco county, Governor of Califronia. No judicial experience.
Warren Burger: Lawyer, Assistant Attorney General, served on the United States Court of Appeals for 13 years.
William Rehnquist: Lawyer, Assistant Attorney General. No judicial experience.
Okay, so of 15 Chief Justices, Roberts has more judicial experience in his two years than 13 of them.