In the case bush vs gore the court ruled that the vote recount in Florida interfered with the candidates equal protection under the law because

The holding of the U. S. Supreme was:"In the circumstances of this case, any manual recount of votes seeking to meet the December 12 "safe harbor" deadline would be unconstitutional under the Equal Protection Clause of the Fourteenth Amendment. Florida Supreme Court reversed and remanded."

Because: "Bush argued that recounts in Florida violated the Equal Protection Clause of the Fourteenth Amendment, because Florida did not have a statewide vote recount standard." (Wikipedia)