WASHINGTON — Hundreds of U.S. government employees — including some with sensitive jobs in the White House, Congress and law enforcement agencies — used Internet connections in their federal offices to access and pay membership fees to the cheating website Ashley Madison, The Associated Press has learned. The AP traced many of the accounts exposed by hackers back to federal workers. They included at least two assistant U.S. attorneys; an information technology administrator in the Executive Office of the President; a division chief, an investigator and a trial attorney in the Justice Department; a government hacker at the Homeland Security Department and another DHS employee who indicated he worked on a U.S. counterterrorism response team.