Peter Orszag, Barack Obama’s budget director, resigned this week partly in frustration over his lack of success in persuading the Obama administration to tackle the fiscal deficit more aggressively, according to sources inside and outside the White House. Mr Orszag, whose publicly stated reasons for leaving were that he was exhausted after years in high pressure jobs and also that he wanted to plan for his wedding in September, is seen as the guardian of fiscal conservatism within the White House. Other members of Mr Obama’s economic team, notably Lawrence Summers, the head of the National Economic Council, have placed...