First off, the idea of smoking marijuana openly at a public bar is just too much to even wrap my head around.  Offering the president a hit of some of yo' stanky bud just made the back of my head explode.

For the president to even be in that setting calls into question the judgement of everyone on his team, because weed isn't like alcohol in the sense that everyone around you is also intaking what you're intaking.  It would be like sitting next to someone, smelling the beer on their breath, and falling off the back of your barstool.  You can't tell me the Prez didn't catch a little contact high.  I'd like to see his room service bill from later that evening.