Political Win: Democrats.
Unless President Trump does something like post a couple of tweets about being required to enforce the law the way congress wrote it...
He plays a different game. I’m not sure about Sessions.
Actually, instead of ignoring the law, if we change the law it's a political win for republicans. Attorney General Sessions (who has the authority under the Controlled Substances Act) can say, "I have administrative authority to remove pot from schedule 1 of the controlled substances act, because it has been found to have medical benefits and a limited potential for abuse, so I'm removing it." That would be a huge step in the right direction from simply ignoring the law. I personally disapprove of marijuana, but I have mixed feelings about legalizing it. Even with my distaste for pot though, I would very much prefer changing the law to simply ignoring the law.
I hope President Trump will either enforce the law and articulate why that is good for our children, or change the law and argue why removing that drug from the banned list is good for America.