Sen. Max Baucus UPDATE 4:35 p.m. We’re now hearing the substance has been deemed harmless, and Baucus’s office has reopened. The Associated Press is reporting that authorities are investigating a suspicious package of the unidentified white powder variety that was delivered to the office of Sen. Max Baucus (D-Mont.). An Associated Press photographer at the scene, in the Hart Senate Office Building, heard officers say there was a threatening note with the package. Schneider…