In it, but not of it. TPM DC
The Senate voted to pass by unanimous consent (that it, without a roll call vote) S. 258, known colloquially as the Saving Kids From Dangerous Drugs Act of 2010, introduced by Sen. Dianne Feinstein (D-CA) and co-sponsored by Sen. Evan Bayh (D-IN) and Charles Grassley (R-IA). While the bill is intended to keep drug dealers from cutting their product with sweets in order to make them more marketable to children, it applies to any drug mixed with with something that modifies its flavor -- as making pot brownies does -- if the person making the brownies "intends" to give it to someone under 18. At that point, the person making the pot brownies would be subject to twice the normal penalty of any person caught distributing weed.
Michael Whitney at Firedoglake reports that Feinstein is an active part of the campaign to defeat California's Proposition 19, which would legalize marijuana in the state. Medical marijuana is already legal in the state, and many people who use medical marijuana do so by mixing it with food in order to counteract the hazards of smoking.