Ensign had previously said he would not run for re-election in 2012 following revelations that he had an affair with a female aide who was the wife of another top aide , and that his parents subsequently gave money to the aides ' family . ` The Washington senator is the focus of a Nevada Congress ethics investigation . Ensign previously had said he would not run for re-election February . two Senate members announced previously they will run for Ensign 's seat .
The Washington senator is the focus of a Nevada Congress ethics investigation . Ensign previously had said he would not run for re-election February . two Senate members announced previously they will run for Ensign 's seat .