NEW YORK: A US government shutdown would harm the country's credit, rating agency Moody's said on Monday, a stern warning coming one month after Fitch downgraded the US by one notch on the back of a debt ceiling crisis.US government services would be disrupted and hundreds of thousands of federal workers furloughed without pay if Congress fails to provide funding for the fiscal year starting October 1.A possible shutdown would be further evidence of how political polarization in Washington is weakening fiscal policymaking at a time of rising...