Which case involved a Supreme Court ruling that effectively determined the outcome of the 2000 Presidential election?

The case that significantly impacted the outcome of the 2000 presidential election is Bush v. Gore. This Supreme Court ruling addressed the contentious issue of the voting recount in Florida, a pivotal state that ultimately determined the election winner. The decision to halt the recount was based on the grounds that the varying standards for evaluating ballots across different counties violated the Equal Protection Clause of the Fourteenth Amendment. By stopping the recount, the Court effectively ensured that George W. Bush's marginal lead was maintained, allowing him to win Florida's electoral votes and secure the presidency.

This case exemplifies the Court's role in electoral disputes and highlights the legal complexities involved in election law. The implications of Bush v. Gore extend beyond this single election, raising questions about the integrity and processes of electoral administration. The other options do not pertain directly to the events surrounding the 2000 election or its immediate aftermath, focusing instead on different issues relating to electoral law and campaign financing.