Mr. Ensign, after having an affair with Mr. Hampton’s wife, Cynthia, arranged tens of thousands of dollars in lobbying contracts for Mr. Hampton through Nevada political allies as a means of finding income for the aggrieved aide and containing the damage from the affair. Mr. Ensign’s parents also gave the Hamptons $96,000 after the senator fired Mr. Hampton from his Senate staff and dismissed Cynthia Hampton from his campaign staff.