http://www.pbs.org/newshour/indepth_coverage/law/corruption/history.htmlPBS Online NewshourThe Keating Five scandal from 1989 implicated five senators in another corruption probe. Democrats Dennis DeConcini of Arizona, Donald Riegle of Michigan, John Glenn of Ohio and Alan Cranston of California, and Republican John McCain of Arizona, were accused of strong-arming federal officials to back off their investigation of Charles Keating, former chairman of the Lincoln Savings and Loan association. In exchange, the senators reportedly received close to $1.3 million in campaign contributions.
The Senate Ethics Committee concluded that Glenn and McCain's involvement in the scheme was minimal and dropped the charges against them. In August 1991, the committee ruled that the other three senators had acted improperly in interfering with the Federal Home Loan Banking Board's investigation.
DeConcini and Riegle did not run for re-election in 1994 and were succeeded by Republican Sens. John Kyl and Spencer Abraham