Sen. John McCain, right, as he endorsed Mitt Romney's bid for the presidency earlier this month. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images

People gather around a car as it is removed by a mobile crane in Tehran, Iran. The car was being driven by Iranian nuclear scientist Mostafa Ahmadi Roshan when it was targeted by a bomb Wednesday. Roshan was killed in the blast. Meghdad Madadi/AP hide caption

itoggle caption Meghdad Madadi/AP