Fox is not covering the birth certificate story per se.
They are covering Trump who is newsworthy because he has indicated he may run in 2012. And Trump is also making big noise about the birth certificate.
Fox,Palin,Bachmann have been successfully shut up because asking about this issue re Obama has been successfully painted as CRAZY and BIRTHER.
Axelrod used Alinsky tactics to make all who dare question seem crazy.
Trump has NOTHING to lose. Trump could care less if the media call him a crazy birther. It won’t hinder him in any way.
Hannity,Palin,Bachmann have all already been alinskyized and attacked to the point of making the birther issue silenced.
Hannity has picked up the ball, more so than just covering Trump.