Hussein Abdallah al Ahmar, brother of Sadeq al-Ahmar, the "sheihk of sheikhs" of the most powerful Yemeni tribe -- the Hashid -- has recently defected from the president's party (the GPC) and denounced Saleh as the "Imam." His brother, Hamid, is also a leading member of Islah and the JMP movement.
While Hamid has been (at times) a very vocal opponent of the Saleh regime since the crisis of 2005, this is the first time I am aware of that this son of Abdullah al-Ahmar (a man who towered above all others in modern Yemeni History) has made what seems to be an irrevocable break with the regime. Could it happen that Sadeq also turns his back on Saleh?
It should also be noted that the protests are getting larger, as attested to in this Washington Post article. Maybe there is hope for change in Yemen.