His hesitation has been understandable: powerful lobbies on one side have insisted that fast-track deals mustbe Christmas-treed with onerous labour and environmental provisions, while free-market Republicans vowed to kill any fast-track so adorned.
Duties are legally enforceable, and although they vary from state to state - in Minneapolis, they include keeping the pavement outside one's house free from snow - the idea is basically that the benefits of the citizen-government relationship mustbe a two-way street.