Cite as: 558 U. S. ____ (2010) 29 Opinion of the Court Before addressing the constitutionality of §608(e)’s independent expenditure ban, Buckley first upheld §608(b), FECA’s limits on direct contributions to candi dates. The Buckley Court recognized a “sufficiently impor tant” governmental interest in “the prevention of corrup tion and the appearance of corruption.” Id., at 25; see id., at 26. This followed from the Court’s concern that large contributions could be given “to secure a political quid pro quo.” Ibid. The Buckley Court explained that the potential for quid pro quo corruption distinguished direct contributions to candidates from independent expenditures. The Court emphasized that “the independent expenditure ceiling . . . fails to serve any substantial governmental interest in stemming the reality or appearance of corruption in the electoral process,” id., at 47–48, because “[t]he absence of prearrangement and coordination . . . alleviates the dan ger that expenditures will be given as a quid pro quo for improper commitments from the candidate,” id., at 47. Buckley invalidated §608(e)’s restrictions on independent expenditures, with only one Justice dissenting. See Fed eral Election Comm’n v. National Conservative Political Action Comm., 470 U. S. 480, 491, n. 3 (1985) (NCPAC). Buckley did not consider §610’s separate ban on corpo rate and union independent expenditures, the prohibition that had also been in the background in CIO, Automobile Workers, and Pipefitters. Had §610 been challenged in the wake of Buckley, however, it could not have been squared with the reasoning and analysis of that precedent. See WRTL, supra, at 487 (opinion of SCALIA, J.) (“Buckley might well have been the last word on limitations on independent expenditures”); Austin, 494 U. S., at 683 (SCALIA, J., dissenting). The expenditure ban invalidated in Buckley, §608(e), applied to corporations and unions, 424 U. S., at 23, 39, n. 45; and some of the prevailing plaintiffs in Buckley were corporations, id., at 8. The

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