Original sentence: Both nominees have problems within their own parties; Menendez has alienated many fellow Democrats with his aggressiveness and abrasiveness, while Kean is unpopular with party conservatives who consider him to be too liberal
Edited sentence: Both nominees have problems within their own parties; Menendez was a close ally of disgraced governor Jim McGreevey and has alienated many fellow Democrats with his aggressiveness and abrasiveness, while Kean is unpopular with party conservatives who consider him to be too liberal