(Portland, OR)  --  Portland police are looking for a 74-year-old man with dementia who's vanished.  Authorities say Jodie Leon Harris was reported to have left the Oregon Health Clinic in the Gateway district around 1:30 yesterday afternoon.  Police say Harris, who doesn't know the Portland area, was last seen walking toward the Fred Meyer store on Northeast 102nd Avenue without a cell phone or identification.  Harris is described as black, five-foot-seven, 190 pounds.  Anyone with information on his location is asked to call 911.