HILLARY CLINTON had probably hoped to avoid the usual rollercoaster of American presidential campaigns, in which candidates must first swing towards the party base in primary elections only to veer back towards the centre for the general election. Yet the Democratic frontrunner has had no such luck, owing in part to a tenacious challenge from Bernie Sanders, a self-described socialist senator from Vermont. Judging by her speech on the economy on July 13th, Ms Clinton is feeling the pressure to lean leftward.
