Gov. Brian Sandoval's recommendation that Medicaid recipients share in the cost of care has been met with criticism from advocates for the poor, but the agency chief who oversees Nevada's complex social safety net programs says such requirements are not a new concept.“We already do cost sharing,” said Mike Willden, director of the Department of Health and Human Services. “Every state does some sharing.”But critics say while that may be true for some programs, requiring copayments from Nevada's poorest residents to receive care goes beyond acceptable boundaries.“This is a tax. It's a tax on poor people,” said Bob Fulkerson, executive …