“The candidates were graded on actions they have taken and statements they have made indicating their support for ending pot prohibition, allowing legal access to medical marijuana and defending states’ rights to set their own marijuana policies. While Democratic candidates found themselves in the middle of the road (with grades ranging from B to D), Republicans were all over the letter-grade spectrum, with Rand Paul pulling down an A- (it seems you’d have to actually support legalization to get an A grade from MPP), and two GOP candidates, Chris Christie and Rick Santorum getting flunked with Fs.”
http://stopthedrugwar.org/chronicle/2015/jul/06/report_card_grading_presidential