The Super Bowl. The classic test of wills, sports' biggest showcase, a champion to be crowned and yet, millions of us tune in for -- the commercials.  Super Bowl Sunday will feature the most creative advertising copy Madison Avenue has to offer, but don't look for any mention of marijuana.

Bloomberg is reporting that CBS has rejected a medical marijuana ad for its Feb. 3 game in Atlanta between the L.A. Rams and the New England Patriots.

Acreage Holdings, the cannabis company backed by former Republican House Speaker John Boehner, wanted to air an ad calling for the legalization of medical marijuana. The ad would've spotlighted two people who have benefited from using it -- a veteran with combat injuries and a child with seizures.

Medical marijuana is currently legal in more than 30 states, but because it's still banned under federal law, it has hampered research and made it hard for some people who could use the drug for medical reasons to be able to get it.

Acreage, which has a market value of $2.4 billion, has cannabis operations in some 15 states. But the company said it was careful to create an ad that was a "call to political action," not one that was meant to promote its brand.