Dissatisfaction with President Obama’s conduct of foreign policy has shot up among both Republicans and Democrats in the past month, even though a slim majority supports his recent decision to send military advisers to Iraq to confront the growing threat from militants there, according to the latest New York Times/CBS News poll. The survey suggests that most Americans back some of Mr. Obama’s approaches to the crisis in Iraq, including majority support for the possibility of drone strikes. But the poll documents an increasing lack of faith in the president and his leadership, and shows deep concern that further intervention...