 Question (ii) — the extent to which non-liberal beliefs and values may be employed in liberal political discussion— has become the subject of sustained debate in the years following Rawls’s Political Liberalism. According to Rawls’s liberalism — and what we might call ‘public reason liberalism’ more generally — because our societies are characterized by ‘reasonable pluralism’, coercion cannot be justified on the basis of comprehensive moral or religious systems of belief. But many friends of religion (e.g., Eberle, 2002; Perry, 1993) argue that this is objectionably ‘exclusionary’: conscientious believers are barred from voting on their deepest convictions. Again liberals diverge in their responses. Some such as Stephen Macedo take a pretty hard-nosed attitude: ‘if some people…feel “silenced” or “marginalized” by the fact that some of us believe that it is wrong to shape basic liberties on the basis of religious or metaphysical claims, I can only say “grow up!”’ (2000: 35). Rawls, in contrast, seeks to be more accommodating, allowing that arguments based on religious comprehensive doctrines may enter into liberal politics on issues of basic justice “provided that, in due course, we give properly public reasons to support the principles and policies that our comprehensive doctrine is said to support” (1999a: 144). Thus Rawls allows the legitimacy of religious-based arguments against slavery and in favor of the United States civil rights movement, because ultimately such arguments were supported by public reasons. Others (e.g., Greenawalt, 1995) hold that even this is too restrictive: it is difficult for liberals to justify a moral prohibition on a religious citizen from voicing her view in liberal political debate.