(Vancouver, WA)  --  A Portland man is slated to spend six-and-a-half years behind bars, following his conviction on a rape charge.  Twenty-seven-year-old David Devon Jackson was found guilty last month of sexually assaulting an 18-year-old Tacoma woman in Vancouver in 2014.  Jackson initially faced three counts of first-degree rape, but was convicted only on a single charge of second-degree rape.