The idea that a majority of voters could support legalizing marijuana may seem far out — but the polls say otherwise. In many states, the prolegalization and antilegalization camps are roughly equal in size. In a poll of Washington state voters released last month, supporters of the legalization referendum outnumbered opponents: 48% vs. 45%. And Washington probably won’t be the only state voting on marijuana this year. In Colorado, supporters last week fell about 3,000 signatures short of getting a legalization measure on the ballot — but the law gave them 15 days to collect the rest, and it seems likely they will. Activists are also collecting signatures in other states, including California, Michigan and Montana.