Nate Silver, 538 –

Three recent polls show that Americans are more sympathetic to the idea of legalizing marijuana than ever before. . . That all three polls show support for legalization passing through the 40 percent barrier may be significant. I compiled a database of every past poll I could find on this subject, including a series of Gallup polls and results from the General Social Survey, and could never before find more than 36 percent of the population (Gallup in October, 2005) stating a position in favor of legalization.