BUCKLEY v. VALEO 1 Opinion of BURGER, C. J. of citizens-those who file tax returns-the power to allocate general revenue for the Act's purposes-and of course only a small percentage of that limited group has exercised the power. There is nothing to assure that the "fund" will actually be adequate for the Act's objectives. Thus, I find it difficult to see a rational basis for concluding that this scheme would, in fact, attain the stated purposes of the Act when its own funding scheme affords no real idea of the amount of the available funding. I agree with MR. JUSTICE REHNQUIST that the scheme approved by the Court today invidiously discriminates against minor parties. Assuming, arguendo, the constitutionality of the overall scheme, there is a legitimate governmental interest in requiring a group to make a "preliminary showing of a significant modicum of support." Jenness v. Fortson, 403 U. S. 431, 442 (1971). But the present system could preclude or severely hamper access to funds before a given election by a group or an individual who might, at the time of the election, reflect the views of a major segment or even a majority of the electorate. The fact that there have been few drastic realignments in our basic two-party structure in 200 years is no constitutional justification for freezing the status quo of the present major parties at the expense of such future political movements. Cf. discussion, ante, at 73. When and if some minority party achieves majority status, Congress can readily deal with any problems that arise. In short, I see grave risks in legislation, enacted by incumbents of the major political parties, which distinctly disadvantages minor parties or independent candidates. This Court has, until today, been particularly cautious when dealing with enactments that tend to perpetuate those who control legislative power. See Reynolds v. Sims, 377 U. S. 533, 570 (1964). I would also find unconstitutional the system of