America's biggest private insurers and Big Pharma are drooling over the prospect of tens of millions more Americans buying insurance and drugs because the pending legislation will require them to, or require employers to cover them. The pending expansion of Medicaid will also be a bonanza. Amerigroup Corp., UnitedHealth Group Inc. and other companies that administer Medicaid are looking at 10 million more customers. Healthcare Inc.’s Medicaid enrollment is expected to jump by 43 percent