If you need a quick intro to the similarities and differences between the revolution in Tunisia and the current revolt in Egypt, you should take a look at this article from CNNI’s Ben Wedeman. Especially this bit:
The protest movements in both nations have also been characterized by strong middle class elements. No surprise then that the dissent in Tunisia has inspired some demonstrators in Egypt.
Just because the middle class joins a revolt, doesn’t mean it will become a successful revolution. But I’m hard-pressed to think of a winning revolution where the middle class wasn’t participating.
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