I don’t believe that this will be on CSpan.
the link for MSNBC is currently up but only broadcasting a picture.
http://www.msnbc.msn.com/id/21134540/vp/44427027#44427027
Here’s the Politico feed. They just accidentally showed their talking heads getting wired up for their preview show which is supposed to start at 7:30:
http://www.politico.com/2012-election/reagan-republican-debate/