A clear majority of Americans support legalizing marijuana for the first time in 40 years, says a new Pew Research Center survey reported by Politico. Fifty-two percent support legalizing the drug and 45 percent oppose legalization. While support has generally tracked upward over time, it has spiked 11 percentage points since 2010. The first public poll on legalizing marijuana, taken by Gallup in 1969, found a whopping 84 percent of the country opposed. Last November, voters in Washington and Colorado decided to legalize marijuana, making those the first two states to do so. Three-fifths of Americans said the federal government shouldn't enforce marijuana laws in those states. Seventy-two percent said the government efforts to enforce marijuana laws cost more than they're worth.