A Maryland sheriff has published an open letter blasting President Obama for his silence on the uptick in deaths of law enforcement officers across the country, including two sheriff's deputies in Harford County. "Dear President Obama," wrote Carroll County Sheriff Jim DeWees, in the letter he posted to Facebook on Saturday. "In case you haven't heard, eight American police officers over the past eight days have been killed in the line of duty. Two of these police officers were Harford County Sheriff's Deputies that were gunned down at a Panera Restaurant just 50 miles from where you live. I've watched...