ANNAPOLIS — Gov. Martin O'Malley ended his attempt yesterday to remove Maryland public schools Superintendent Nancy S. Grasmick, after he did not appear to have the political support to get rid of the successful and longtime education leader. "I definitely wasn't going to support the effort," said Delegate Jill P. Carter, Baltimore Democrat. "Think we need checks and balances, that's what we're there for." Mr. O'Malley, a Democrat, made the announcement during a last-minute press conference, in which he ended his political dispute with Mrs. Grasmick by shaking hands, then telling the Democrat-controlled General Assembly to drop legislation that would...