Another email arrived the other day from a citizen who blames Democrats for everything bad about Baltimore — for the poverty and the potholes, the homicides and homelessness, the high property taxes and the trash in the Inner Harbor. These assertions have been arriving in a moderate flow since the April riot, framed between harsh criticism of Baltimore's Democratic mayor and soaring praise for Maryland's Republican governor who "saved the city."The most recent email came from an "interested friend" — few writers of these letters sign their names — who declared: "Democrats have had Baltimore in its grip for 50...