As community groups, brokers and insurers prepare to recruit people for enrollment in medical plans that go on sale in October under the health-care overhaul, nobody has a bigger financial stake in their success than hospitals. And few may work harder to sign up consumers for the health-insurance marketplaces than hospitals themselves. "This is a major project for the next year," said Craig Cooper, spokesman for Genesis Health System of Iowa, which hopes to enroll thousands of patients and substantially cut its $60 million annual bill for people who cannot afford to pay for care.