"Under Sharia Law she cannot come as his wife, if he is Muslim. Sharia law prevents a Muslim leader from bringing his wife to a political event. Any Muslim following the Islamic Creed would know not to bring a non-believer as his wife.
An expert on the Middle East, Scholar Dr. Jim Murk gives a better explanation than mine. An orthodox Muslim man would never take his wife on a politically oriented trip to any Nation ruled by Sharia Law. Michelle would know not to ask to travel with him. Remember, once Mr. Obama got to Saudi Arabia he already knew the protocol and bowed to the King. In those countries Obama is seen as Muslim, because his father was a Muslim from Kenya."Hat tip to Willswordsofwisdom. You can read his full post on this here