This is where they are shouting on bullhorns again, outraged because they say the Muslim Brotherhood has stolen the revolution and is railroading though a constitution that could lock in Muslim Brotherhood rule for 50 years, bringing more Islamic law. They cry — not against Islam — but that an extremist interpretation is being forced down their throats by a president who critics say is acting every part the tyrant.

This is also a warning, they claim, of what may happen across the Middle East. The era of the Muslim Brotherhood appears to have arrived. President Obama has hailed the Brotherhood’s President Mohammed Morsi as a pragmatist who helped end the Gaza crisis. Egyptians here think the Brotherhood has conned Washington, just like it conned them.

“President Obama is supporting a terrorist,” a man told me amid chants of “Leave! Leave!” in Tahrir Square and “Down, down with the rule of the Muslim Brotherhood’s spiritual leader.” Before, it was “Down, down with Mubarak.”