(Portland, OR)  --  A ballot measure that would create affordable housing for the Portland area is on the verge of passage.  Measure 26-179 is favored by more than 60 percent of Multnomah County voters.  Officials say it's intended to generate about 258-million dollars in revenue for affordable housing in Portland.  Homeowners would pay an average of about 75 dollars per year over the next 20 years.