Cite as: 596 U. S. ____ (2022) 15 Opinion of the Court to these requirements. See post, at 3, 14–15. And the requirements are themselves prophylactic measures, given that “few if any contributions to candidates will involve quid pro quo arrangements.” Citizens United, 558 U. S., at 357. Such a prophylaxis-upon-prophylaxis approach, we have explained, is a significant indicator that the regulation may not be necessary for the interest it seeks to protect. See McCutcheon, 572 U. S., at 221; see also Bennett, 564 U. S., at 752 (“In the face of [the State’s] contribution limits [and] strict disclosure requirements . . . it is hard to imagine what marginal corruption deterrence could be generated by [an additional measure].”). There is no cause for a different conclusion here. Because the Government is defending a restriction on speech as necessary to prevent an anticipated harm, it must do more than “simply posit the existence of the disease sought to be cured.” Colorado Republican Federal Campaign Comm. v. Federal Election Comm’n, 518 U. S. 604, 618 (1996). It must instead point to “record evidence or legislative findings” demonstrating the need to address a special problem. Ibid. We have “never accepted mere conjecture as adequate to carry a First Amendment burden.” McCutcheon, 572 U. S., at 210 (quoting Nixon v. Shrink Missouri Government PAC, 528 U. S. 377, 392 (2000)). Yet the Government is unable to identify a single case of quid pro quo corruption in this context—even though most States do not impose a limit on the use of post-election contributions to repay candidate loans. Cf. Brief for Campaign Legal Center et al. as Amici Curiae 17–18 (citing the 10 States that do impose such a prohibition). Our previous cases have found the absence of such evidence significant. See Citizens United, 558 U. S., at 357 (the Government did not claim that the political process was corrupted in the 26 States that allowed unrestricted independent expenditures by corporations); McCutcheon, 572 U. S., at 209, n. 7 (the Government presented no evidence of corruption in the 30

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