BUCKLEY v. VALEO 1 Per Curiam provisions for funding nominating conventions must also be rejected. 3. Primary Election Campaign Financing Appellants' final challenge is to the constitutionality of Chapter 96, which provides funding of primary campaigns. They contend that these provisions are constitutionally invalid (1) because they do not provide funds for candidates not running in party primaries 142 and (2) because the eligibility formula actually increases the influence of money on the electoral process. In not providing assistance to candidates who do not enter party primaries, Congress has merely chosen to limit at this time the reach of the reforms encompassed in Chapter 96. This Congress could do without constituting the reforms a constitutionally invidious discrimination. The governing principle was stated in Katzenbach v. Morgan, 384 U. S. 641, 657 (1966): "[I]n deciding the constitutional propriety of the limitations in such a reform measure we are guided by the familiar principles that a 'statute is not invalid under the Constitution because it might have gone farther than it did,' Roschen v. Ward, 279 U. S. 337, 339, that a legislature need not 'strike at all evils at the same time,' Semler v. Dental Examiners, 294 U. S. 608, 610, and that 'reform may take one step at a time, addressing itself to the phase of the problem which seems most acute to the legislative mind,' Williamson v. Lee Optical Co., 348 U. S. 483, 489." 143 142 With respect to the denial of funds to candidates who may not be affiliated with a "political party" for the purposes of public financing, see n. 118, supra. 143Appellants argue that this reasoning from Katzenbach v. Morgan, is inapplicable to this case involving First Amendment guarantees. But the argument as to the denial of funds to certain