Detroit, you're not alone. Across the nation, cities and states are watching Detroit's largest-ever municipal bankruptcy filing with fear. Years of underfunded retirement promises to public sector workers, which helped lay Detroit low, could plunge them into a similar financial hole. A CNBC.com analysis of more than 120 of the nation's largest state and local pension plans finds they face a wide range of financial burdens as aging work forces near retirement. Thanks to a patchwork of accounting practices and rosy investment assumptions, it's not even clear just how big a financial hole many states and cities have dug for...