Analysis-Moody's downgrade intensifies investor worry about US fiscal path

By Davide Barbuscia NEW YORK (Reuters) -A U.S. sovereign downgrade by Moody's has exacerbated investor worries about a looming debt time-bomb that could spur bond market vigilantes who want to see more fiscal restraint from Washington. The ratings agency cut America's pristine sovereign credit rating by one notch on Friday, the last of the major ratings agencies to downgrade the country,