Voters in California rejected mandatory labeling two years ago, and a similar effort in Washington State failed last year. Vermont is the only state that has a mandate on GMO labeling. The law is scheduled to take effect in 2016 but has been challenged in court.
(Oregon results were too close to call as of midnight Central Time, checkhttps://gov.oregonlive.com/election/ for results, see Ballot Measure 92)