As the nation’s chief diplomat, Hillary Clinton was responsible for ascertaining whether information in her possession was classified and acknowledged that “negligent handling†of that information could jeopardize national security, according to a copy of an agreement she signed upon taking the job. A day after assuming office as secretary of state, Clinton signed a Sensitive Compartmented Information Nondisclosure Agreement that laid out criminal penalties for “any unauthorized disclosure†of classified information. Experts have guessed that Clinton signed such an agreement, but a copy of her specific contract, obtained by the Competitive Enterprise Institute through an open records request and...