Bill Clinton is ready to campaign for Barack Obama whenever the Democrat needs him, the former US president said at a New York news conference on Thursday. Relations between Clinton and Obama have only just began to thaw since Obama defeated the former president's wife in the bruising Democratic primary. Throughout the race, the former president portrayed Obama as too inexperienced. Since Obama clinched the nomination, it has been an open question as to what role Clinton would play in the campaign. Just weeks ago, Obama called the former president to ask for his help. Clinton said the timetable is up to Obama.