File - In this March 28, 2011, file photo shows a marijuana plant, in Portland, Ore. Medical marijuana advocates have a message for Democratic leaders and federal prosecutors with an eye on political office: Don’t mess with pot. Pushing back against the Obama administration’s crackdown on state medical marijuana programs, one of the nation’s largest pro-pot groups is claiming credit for the defeat of a former federal prosecutor in the Democratic primary for Oregon attorney general. As interim U.S. attorney, Dwight Holton called Oregon’s medical marijuana law a “train wreck” and oversaw efforts to crack down on pot shops and marijuana gardens that claim to be operating under the state law. (AP Photo/Rick Bowmer, File)