NEW YORK (Reuters) - For months, the U.S. State Department has stood behind its former boss Hillary Clinton as she has repeatedly said she did not send or receive classified information on her unsecured, private email account, a practice the government forbids. While the department is now stamping a few dozen of the publicly released emails as "Classified," it stresses this is not evidence of rule-breaking. Those stamps are new, it says, and do not mean the information was classified when Clinton, the Democratic frontrunner in the 2016 presidential election, first sent or received it. But the details included in...