The unions...assert that "[t]he ability of municipal employees to engage in the activity of bargaining collectively with their employers, in the hope of reaching a voluntary agreement regarding their wages and other conditions of employment, is a fundamental right." The unions further aver that both the Supreme Court and our court have long recognized that the Constitution protects this right....

None of those cases [cited by the unions] establish what the unions assert here: that they have a constitutional entitlement to collectively bargain with the state. And we find that the unions' contention that this is a long-standing fundamental right difficult to square with the fact that several states have prohibited public-sector collective bargaining over at least some topics.