AP Photo

If you’re elected president or prime minister in pretty much any country in the developed world today, you’re faced with the same set of challenges: to reduce national deficits without choking off a fragile recovery; to trim the welfare state and raise taxes while still funding the things that lead to long-term growth; to try to enact brutally painful measures at a time when voters don’t trust their leaders; to do it at a time when politics are polarized and a hundred different interest groups have the ability to block change.