Press Democrat:  “The Obama administration’s statewide crackdown on medical marijuana dispensaries has landed a one-two punch in Marin County.  The Marin Alliance for Medical Marijuana, the state’s oldest dispensary, has posted a sign at its Fairfax storefront officeannouncing that the dispensary will shut down Dec. 17.  And Medi-Cone, a medical marijuana collective that was cultivating, harvesting and packaging medical marijuana for several Bay Area dispensaries ceased operations last week due to increased scrutiny by authorities