I'm reading 'Game Change' now.<br/>And in it, there was a sentence below.<br/>('he' means Bill Clinton.)<br/><br/>-----<br/>"When he had his toughest test, impeachment, he never gave up, never quit," an old Clinton hand observed.<br/>-----<br/><br/>What does 'an old Clinton hand' mean?<br/><br/>Someone who worked for Clinton?<br/>Someone who knows very well about Clinton?