In recent years the U.S. Supreme Court has shown zero tolerance for voter fraud or for government policies and actions that dilute the value of a citizen’s vote.

Below are just a few quotes from the Court on the subject of fraudulent voting and illegal election practices.

Effect of Forged Ballots

The deposit of forged ballots in the ballot boxes, no matter how small or great their number, dilutes the influence of honest votes in an election, and whether in greater or less degree is immaterial. The right to an honest [count] is a right possessed by each voting elector, and to the extent that the importance of his vote is nullified, wholly or in part, he has been injured in the free exercise of a right or privilege secured to him by the laws and Constitution of the United States. Anderson v. United States, 417 U.S. 211, 226

[T]he right of suffrage can be denied by a debasement or dilution of the weight of a citizen’s vote just as effectively as by wholly prohibiting the free exercise of the franchise. Reynolds v. Sims, 377 U.S. 533, 555.

Constitutional Right to Have Only Legal Votes Counted

Obviously included within the right to [vote], secured by the Constitution, is the right of qualified voters within a state to cast their ballots and have them counted if they are validly cast. United States v. Classic, 313 U.S. 299, 315 (1941).

[T]he right to have the vote counted [means counted] at full value without dilution or discount. Reynolds v. Sims, 377 U.S. 533, 555.

Every voter in a federal . . . election, whether he votes for a candidate with little
chance of winning or for one with little chance of losing, has a right under the Constitution to have his vote fairly counted, without its being distorted by fraudulently cast votes. Anderson v. United States, 417 tJ.S. 211, 227.

Equal Protection under the 14th Amendment

The right to vote is protected in more than the initial allocation of the franchise.
Equal protection applies as well to the manner of its exercise. Having once granted the right to vote on equal terms, the State may not, by later arbitrary and disparate treatment, value one person’s vote over that of another. Bush v. Gore, 531 U.S. 98, 104-5.

[W]henever a state or local government decides to select persons by popular election to perform governmental functions, [equal protection] requires that each qualified voter must be given an equal opportunity to participate in that election. Hadley, v. Junior College District, 397 U.S. 50, 56.

The idea that every voter is equal to every other voter in his State, when he casts his ballot in favor of one of several competing candidates, underlies many of [the Supreme Court’s] decisions. Gray v. Sanders, 372 U.S. 368, 380.

Court’s Authority to Decide Voter Fraud Cases

A significant departure from the legislative scheme for appointing Presidential electors presents a federal constitutional question. Bush, 531 U.S. at 113