Hillary Rodham Clinton retains broad public support for her performance as secretary of state, a sign that President Obama’s struggles abroad and Republican attacks over Benghazi have not been a major drag on her reputation. “More people blame the White House than they blame the secretary of state, and that strikes me as quite appropriate,” said Kori Schake, a former State Department official during the George W. Bush administration. The public “admires Secretary Clinton’s toughness and how much she got out there and tried to do stuff.” With many of the Obama administration’s foreign policy priorities still unresolved, Clinton has...