Cite as: 572 U. S. ____ (2014) 9 Opinion of ROBERTS, C. J. because most large donors do not seek improper influence over legislators’ actions. Although the Court accepted that premise, it nevertheless rejected the overbreadth challenge for two reasons: First, it was too “difficult to isolate suspect contributions” based on a contributor’s subjective intent. Id., at 30. Second, “Congress was justified in concluding that the interest in safeguarding against the appearance of impropriety requires that the opportunity for abuse inherent in the process of raising large monetary contributions be eliminated.” Ibid. Finally, in one paragraph of its 139-page opinion, the Court turned to the $25,000 aggregate limit under FECA. As a preliminary matter, it noted that the constitutionality of the aggregate limit “ha[d] not been separately addressed at length by the parties.” Id., at 38. Then, in three sentences, the Court disposed of any constitutional objections to the aggregate limit that the challengers might have had: “The overall $25,000 ceiling does impose an ultimate restriction upon the number of candidates and committees with which an individual may associate himself by means of financial support. But this quite modest restraint upon protected political activity serves to prevent evasion of the $1,000 contribution limitation by a person who might otherwise contribute massive amounts of money to a particular candidate through the use of unearmarked contributions to political committees likely to contribute to that candidate, or huge contributions to the candidate’s political party. The limited, additional restriction on associational freedom imposed by the overall ceiling is thus no more than a corollary of the basic individual contribution limitation that we have found to be constitutionally valid.” Ibid.