One big beneficiary of the decision to have some Congressional staff purchase health benefits on the new marketplaces may be the marketplace right here in the District. In rules published Wednesday, the Office of Personnel Management outlined how Hill staff would continue to receive health insurance benefits that their employer (Congress) would finance. While there are still a few looming questions about the nuts and bolts of how this will work, it near certainly means an influx of young, healthy people in the District of Columbia's relatively tiny marketplace.