The federal Liberals are only one week old as a government and are already being forced to face up to the realities of power. The pleasant portrait they painted on the campaign trail, of limited, short-term deficits averaging $10 billion a year for three years, is already in serious doubt. A report issued Tuesday by the Parliamentary Budget Office indicates that, before the Liberals could borrow a single extra cent, the anticipated deficit was likely to be $4.3 billion a year worse than expected over the next four years. It’s based on new revenue estimates that project slower growth for oil prices. The PBO expects the economy to produce $32 billion less income than predicted next year and $43 billion less in 2017.