More coverage of the US presidential campaign this week, with a focus on two of the hot-button issues for the Republicans and Democrats respectively—immigration and healthcare. Will Straw, who is also blogging for us this week from South Carolina, explains why immigration is so important to Republican voters and looks at the prospects for reform. Aimee Donnellan on the need for reform of the US healthcare system, and the differences between the various Democratic candidates’s plans. Plus Johan Wennström on why conservatives should be hoping for an Obama victory. And Steven Hill of the New America Foundation , with a plan for how to fix America’s broken primary system. Meanwhile, following last month’s cover story on Ireland’s new breed of super-rich, our own Mary Fitzgerald takes a look at the darker side of Ireland’s stunning economic boom.