A year ago the Egyptian Muslim Brotherhood's creed looked like a winning political formula. Now the Islamists have been removed from power by the army and millions of Egyptians see that as a cause for celebration. Meanwhile, Turkey's moderate Islamist rulers have faced unprecedented mass protests - and in Tunisia political Islam is on the defensive. Stephen Sackur speaks to Turkish writer Mustafa Akyol and Egyptian feminist and political activist Dina Wahba. Is political Islam failing, if so why?