Barack Obama, US president, offered more support for protesters against the global financial system after a weekend of demonstrations in cities around the world, but called on them not to “demonise” those who worked on Wall Street. On Sunday, Mr Obama honoured Martin Luther King at a dedication to a new memorial on National Mall in Washington. Referring to protests that have spread from Wall Street to London, Rome and elsewhere, Mr Obama said: “Dr King would want us to challenge the excesses of Wall Street without demonising those who work there.” Mr Obama had previously said the protests “express...