Stockton, Calif., prepares for bankruptcy. Are other US cities at risk?

The flag of Stockton, Calif., flies near city hall on June 26, in Stockton, Calif. (Ben Margot/AP) The city of Stockton, Calif., population 290,000, is paving the way for a court filing that would make it the largest US city ever to enter bankruptcy. Stockton got trapped between a housing bust, which…