The 2016 presidential field is the most pro-marijuana in history, according to one of the nation’s leading pro-legalization groups.

The updated Presidential Candidate Voter Guide for the General Election from the Marijuana Policy Project (MPP) grades each candidate on how favorable they are towards marijuana legalization. GOP nominee Donald Trump got the lowest grade out of all the candidates — earning a “C+” grade.

“In 1990, Trump said he favored legalizing all drugs, but more recently he has said he opposes legalizing and regulating marijuana for adult use,” reported MPP. (RELATED: Here’s Where Each Presidential Candidate Stands On Marijuana Legalization)

“He supports legal access to medical marijuana, and he believes states should be able to set their own marijuana policies with regard to adult use.” Trump’s main rival former Secretary of State Hillary Clinton was given a “B” grade, while Sen. Bernie Sanders got an “A.”

MPP’s new guide, released at the end of May, includes former New Mexico Gov. Gary Johnson, nominated by the Libertarian Party, and the presumptive Green Party nominee Jill Stein. (RELATED: Did Marijuana Just Get Its Presidential Candidate?)

Both Johnson and Stein were awarded “A+” grades for their pro-legalization stances. “This is the most marijuana-friendly field of presidential candidates in history,” said Robert Capecchi, MPP director of federal policies.

“All of the candidates support legal access to medical marijuana, and most of them support making it legal for adults and regulating it like alcohol. Even the least friendly candidate agrees that states should be able to able to determine their own marijuana laws without federal interference,” Capecchi added.

“Gov. Johnson and Dr. Stein are both exceptionally sensible on this issue. They both have backgrounds that provide them with more insight into the subject than their counterparts in the major parties.”

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