indicated that the Equal Protection Clause required that state legislative districts be apportioned on an equal basis: "legislators represent people, not trees or acres. Legislators are elected by voters, not farms or cities or economic interests." His holding upheld the principle of "one man, one vote," which had previously been articulated by Douglas. After the decision, the states reapportioned their legislatures quickly and with minimal troubles. Numerous commentators have concluded reapportionment was the Warren Court's great "success story." Civil rights Civil rights continued to be a major issue facing the Warren Court in the 1960s. In Peterson v. Greenville (1963), Warren wrote the Court's majority opinion, which struck down local ordinances that prohibited restaurants from serving black and white individuals in the same room. Later that decade, the Court upheld the constitutionality of the Civil Rights Act of 1964 in Heart of Atlanta Motel, Inc. v. United States. The Court held that the Commerce Clause empowered the federal government to prohibit racial segregation in public accommodations like hotels. The ruling effectively overturned the 1883 Civil Rights Cases in which the Supreme Court had held that Congress could not regulate racial discrimination by private businesses. The Court upheld another landmark civil rights act, the Voting Rights Act of 1965, by holding that it was valid under the authority provided to Congress by the Fifteenth Amendment. In 1967, Warren wrote the majority opinion in the landmark case of Loving v. Virginia in which the Court struck down state laws banning interracial marriage. Warren was particularly pleased by the ruling in Loving since he had long regretted that the Court had not taken up the similar case of Naim v. Naim in 1955. In Harper v. Virginia State Board of Elections (1966), the Court struck down poll taxes in state elections. In another case, Bond v. Floyd, the Court required the Georgia legislature to seat the newly-elected legislator Julian Bond; members of the legislature had refused to seat Bond because he opposed the Vietnam War. Warren Commission Shortly after the assassination of John F. Kennedy, the newly-sworn-in president, Lyndon B. Johnson, convinced Warren to serve as the head of a bipartisan commission tasked with investigating the assassination. From December 1963 to October 1964, Warren simultaneously served as chief justice of the United States and chairman of the Warren Commission. At the start of the investigation, Warren decided to hire the commission's legal staff