DeMarco's backups

As long as DeMarco Murray can stay on the field, the Dallas Cowboys know that they've got one of the NFL's top lead RBs in the backfield. Of course, that has been a bit of an issue in Murray's two professional seasons, as he's only played 23 of a possible 32 contests in 2011 and 2012. So the identity of his backups is a pretty important development this offseason.