As tension mounted here in anticipation of Sunday protests against President Mohamed Morsy, another foe emerged for many Egyptians: the United States. SNIP For months, Egyptian liberals and moderates have grown angrier over what they say is inexplicable U.S. support for Islamists. In Tahrir Square, Cairo's epicenter of protest since 2011, graffiti near the Egyptian Museum declares: “Down with the Brotherhood, Down with America!” On a downtown building, a poster shows a distorted portrait of U.S. Ambassador Anne Patterson over the words, “Crone, Go Home.” On a nearby corner, another poster says, “Obama supports terrorism.” SNIP In a recent speech,...