Okay, this is getting tedious. Historically, Americans have not elected black men president of the United States. You do realize that right? Now, in 2008 we did. Likewise, historically Americans did not favor legalizing pot. Gallup, for the first time ever, thirteen months ago found in a poll that most Americans favored legalizing pot.
The US experiment with legalizing pot will end soon, well before you're king.
You also made a claim about "presently" which the poll addresses. As for the experiment ending soon, time - not prognostication - will tell.