ROCHESTER, Mich (Metro Source)  Eight Republican presidential candidates will be at Oakland University tonight for a debate hosted by cable network CNBC.  This is the first time that the top seven contenders have been on stage together since an October 18th meeting in Las Vegas.  Cain joins Michele Bachmann, Newt Gingrich, Jon Huntsman, Ron Paul, Rick Perry, Mitt Romney, and Rick Santorum in the 90-minute debate that starts at 8 p.m.