According to a new poll conducted by Public Policy Polling, nearly two-thirds of Minnesota voters support changing state law to allow people with serious and terminal illnesses to use medical marijuana if their doctors recommend it. The poll also found that the majority of voters would disapprove of their county sheriff or county attorney working to defeat such a bill. [caption id="attachment_6056" align="alignright" width="199"] Joni Whiting (Center) (Photo by Andrew VonBank)[/caption] "Personal…