 A sign of how the American consumer is holding up comes tomorrow when the Commerce Department releases retail sales numbers for June. Sales have been pretty flat for the last few months as shoppers have held back on spending. If that continues, it could boost the case for an interest rate cut. Marketplace's Henry Epp has more. Ask retail analysts to sum up how consumers are feeling right now, and the vibe sounds not great. Cautious. Jittery. I think they're in a wait-and-see mode.