The people have spoken. Pot is legal in CO.
No it is not. Pot is illegal anywhere in the U.S. under federal law.
It should be up to Colorado to decide whether or not to allow the intrastate production, purchase and sale of pot, but it is not. At least, not according to over 70 years of U.S. Supreme Court decisions, from Wichard v. Filburn in 1942 through Gonzales v. Raich in 2005.
I can't wait to see their vote on the issue of slavery. Do you think they might legalize it?
On the other hand, i'm not sure you are grasping this "federalism" stuff correctly.