Low demand for veteran running backs

The PFT Hot 100 contains seven running backs.  Six of them still haven’t signed. The only one that has — Peyton Hillis — got a one-year deal with a base value of $2.6 million. So why haven’t Michael Bush (pictured), Mike Tolbert, BenJarvus Green-Ellis, Kevin Smith, Cedric Benson, and Justin Forsett put their John Henry…