Uh, you appear to be blunt simply flat out mistaken on this point.Hillary is blowing non-THC laced smoke up everyone's collective ass about this. She is great at pandering though so there are people that love to hear this and she knows it. It would be great if she actually could get MJ rescheduled, and I would 100% support it, but she doesn't have that power.
Crucially while it appears the current legislation on this matter mentions marijuana as a potential schedule 1 drug, it makes it clear that the executive branch has the power to change it to a different schedule designation. (Basically a drug can be determined to be exempted or better belong to a different scheduling level by basically the US Attorney and General and the Health and Human Services Secretary both of whom Hillary would be in charge of appointing if elected President. For that matter Hillary would retain the potential power to fire either of them if she became fed up with how they were acting towards desired policy goals.)
https://en.wikipedia.org/wiki/Removal_of_cannabis_from_Schedule_I_of_the_Controlled_Substances_Act
(It probably wouldn't happen overnight given the apparent process, but it could happen reasonably quickly if the executive branch really wants to resolve the issue.)
While theoretically most likely a Republican Congress could try to fight the decision in court, especially a Schedule II designation would be highly unlikely to ultimately be overturned given the evidence that marijuana has potential medical uses which could be pointed to by now.
