The edge in Tennessee belongs to Santorum, but Romney has been gaining momentum, and this is a chance for him to prove that he can perform well in the South.
The delegates are awarded proportionally both by the state vote and according to Congressional district, and again, both Santorum and Romney could emerge with a similar delegate count. (Gingrich could also get some here, provided he hits the 20 percent threshold making him eligible for statewide delegates).
Still, a win here for Romney would be big, and along with Ohio could make the difference – beyond just the delegate numbers – on Super Tuesday being seen as a major win for him.