How will they distinguish the Agricultural Adjustment Act case from 1942?

In Wickard v. Fillburn, 317 U.S. 111 (1942), the Supreme Court held that a farmer who grew wheat for his own consumption (more or less) was nevertheless engaged in interstate commerce enough to fall legitimately within the scope of the Agricultural Adjustment Act.

Now, some lawyers in California are arguing that Congress does not the power to regulate marijuana grown for intrastate consumption, according this report, via CrimLaw.