how many votes in congress to repeal a law
Repeal In the United States, when a bill is passed by the House and Senate and signed by the president, or Congress overrides a presidential veto, the various provisions contained within the newly enacted law are rearranged according to their policy content and cataloged in the United States Codeâ€”a compilation of the general and permanent federal laws of the United States. To repeal any element of an enacted law, Congress must pass a new law containing repeal language and the codified statute's location in the U.S. Code (including the title, chapter, part, section, paragraph and clause). In this way, Congress (and the president) must follow the same rules and procedures for passing any law. When statutes are repealed, their text is simply deleted from the Code and replaced by a note summarizing what used to be there. Once deleted, the repealed statute no longer has the force of law. All repeals of parts of the US Code are, therefore, express repeals.
Warren Court In the key apportionment case Reynolds v. Sims (1964)[23]  Warren delivered a civics lesson: "To the extent that a citizen's right to vote is debased, he is that much less a citizen," Warren declared. "The weight of a citizen's vote cannot be made to depend on where he lives. This is the clear and strong command of our Constitution's Equal Protection Clause." Unlike the desegregation cases, in this instance, the Court ordered immediate action, and despite loud outcries from rural legislators, Congress failed to reach the two-thirds needed pass a constitutional amendment. The states complied, reapportioned their legislatures quickly and with minimal troubles. Numerous commentators have concluded reapportionment was the Warren Court's great "success" story.[24]