A TV news anchor in central Illinois says his days are numbered.  Dave Benton, with WCIA-TV in Champaign, has been fighting brain cancer and the tumor is too large for surgery or radiation.  He told viewers Thursday he only has four to six months to live.  He's hoping to add a few days by trying out a new treatment that might be able to slow the growth of the tumor.  Benton says he'll work as long as he can.  He grew up in the Chicago suburb of Addison.  Benton and his wife have two adult kids.