Cite as: 572 U. S. ____ (2014) 3 Opinion of ROBERTS, C. J. exchange of an official act for money. See McCormick v. United States, 500 U. S. 257, 266 (1991). “The hallmark of corruption is the financial quid pro quo: dollars for political favors.” Federal Election Comm’n v. National Conservative Political Action Comm., 470 U. S. 480, 497 (1985). Campaign finance restrictions that pursue other objectives, we have explained, impermissibly inject the Government “into the debate over who should govern.” Bennett, supra, at ___ (slip op., at 25). And those who govern should be the last people to help decide who should govern. The statute at issue in this case imposes two types of limits on campaign contributions. The first, called base limits, restricts how much money a donor may contribute to a particular candidate or committee. 2 U. S. C. §441a(a)(1). The second, called aggregate limits, restricts how much money a donor may contribute in total to all candidates or committees. §441a(a)(3). This case does not involve any challenge to the base limits, which we have previously upheld as serving the permissible objective of combatting corruption. The Government contends that the aggregate limits also serve that objective, by preventing circumvention of the base limits. We conclude, however, that the aggregate limits do little, if anything, to address that concern, while seriously restricting participation in the democratic process. The aggregate limits are therefore invalid under the First Amendment. I A For the 2013–2014 election cycle, the base limits in the Federal Election Campaign Act of 1971 (FECA), as amended by the Bipartisan Campaign Reform Act of 2002 (BCRA), permit an individual to contribute up to $2,600 per election to a candidate ($5,200 total for the primary

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