We would support a bill to encourage donations to support services to people with serious mental illness, but opposed a check off that limits the support to fighting stigma. (By the way, we don't believe stigma exists).
According Skale's Rule:
The role of stigma in inhibiting care (if any) is inversely related to the severity of illness. Stigma may possibly inhibit some high functioning individuals from accessing care, but stigma is not why homeless psychotic people can't access care.