Baltimore Mayor Martin O'Malley yesterday accused agents of Maryland Gov. Robert L. Ehrlich Jr.'s administration of spreading false rumors that he had an extramarital affair, and Ehrlich responded hours later by dismissing a longtime employee. The mayor, a Democrat considering a bid for governor in 2006, said he believes that the widespread and persistent rumors were part of a "concerted and orchestrated and sustained" effort and called on the Republican governor to apologize to his wife and children. "I don't think any of us run for office expecting that this sort of hurt will be heaped on our kids or...