Sanders and Hillary both back Obamas official lines including increased wars, creating/arming ISIL/ISIS (yes, that was created by the US, directly. Don't kid yourself. In 30 years it will come out of a declassified document, just like Cointelpro, Bay of Pigs and the 1973 cope in Chile).

In regards to legalization, I don't think the US federal government will take a stance either way, unless Canada gets full legalization passed first. The biggest reason that it simply can't be legal at a federal level involves international treaties (which is why it's not even technically legal in The Netherlands, even though there are laws governing growing, sale and taxation .. even though it's still not legal to sell.. it's just 'tolerated' and taxed ...and regulated).