An NRO offshoot, Opinion Duel is a new (revived) debate feature up today. First up: We’ve got David Rivkin and Richard Epstein debating domestic survelliance today (it’s a one-day debate, a new regular feature–fortnightly like NRODT). David’s first post is up and Richard–who signed this letter to Congress on the NSA program–will have a comeback in a few. Stay tuned all day for updates.