Voters in Oregon, Alaska, and Washington, D.C. approved ballot measures that allow the use of marijuana by adults, boosting legalization activists who hope to extend their winning streak across the country. Oregon and Alaska join fellow states Colorado and Washington, where voters approved recreational use of pot two years ago. D.C. is on the same path unless Congress, which has review power, blocks the move. In Florida, a ballot measure that would have permitted the use of medical marijuana failed to reach the 60 percent mark required for constitutional amendments.