Cite as: 540 U. S. 93 (2003)
Opinion of the Court
contributor's ability to engage in free communication." Id., at 20; see also, e. g., Beaumont, supra, at 161; Shrink Missouri, supra, at 386-388. In Buckley we said:
"A contribution serves as a general expression of support for the candidate and his views, but does not communicate the underlying basis for the support. The quantity of communication by the contributor does not increase perceptibly with the size of the contribution, since the expression rests solely on the undifferentiated, symbolic act of contributing. At most, the size of the contribution provides a very rough index of the intensity of the contributor's support for the candidate. A limitation on the amount of money a person may give to a candidate or campaign organization thus involves little direct restraint on his political communication, for it permits the symbolic expression of support evidenced by a contribution but does not in any way infringe the contributor's freedom to discuss candidates and issues. While contributions may result in political expression if spent by a candidate or an association to present views to the voters, the transformation of contributions into political debate involves speech by someone other than the contributor." 424 U. S., at 21 (footnote omitted).
Because the communicative value of large contributions inheres mainly in their ability to facilitate the speech of their recipients, we have said that contribution limits impose serious burdens on free speech only if they are so low as to "preven[t] candidates and political committees from amassing the resources necessary for effective advocacy." Ibid.
We have recognized that contribution limits may bear "more heavily on the associational right than on freedom to speak," Shrink Missouri, supra, at 388, since contributions serve "to affiliate a person with a candidate" and "enabl[e] like-minded persons to pool their resources," Buckley, 424 U. S., at 22. Unlike expenditure limits, however, which
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