SACRAMENTO -- In the healthcare world, there's not a whole lot that insurers, doctors and union workers all agree on. But a new coalition of powerful Capitol players from all three groups is hoping to reverse recent budget cuts, pushed by Gov. Jerry Brown, to those who provide care to the poorest Californians. But doctors, hospital officials and others say the rate cuts could threaten the success of the federal law. They say lower reimbursements for treating poor patients will reduce the number of people who agree to treat Medi-Cal patients.