Republican presidential candidate Donald Trump gestures during a meeting with first responders at St. Johns County Sheriffs Department on Monday in St. Augustine, Fla. Evan Vucci AP
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This isn’t the first time people have called on others to trade votes to help a certain candidate. In 2000, several vote-swapping websites asked people in swing states who wanted to vote for Ralph Nader to switch votes to benefit Al Gore. One was dubbed Nader Trader, and had 90,000 hits just days before the 2000 election, according to Slate.

It does not violate federal law, because that law is narrow and specifies that a voter must receive something of monetary value for it to be illegal. Since a vote doesn’t have monetary value, federal law doesn’t apply. But the California secretary of state said vote-swapping for Nader and Gore was against state election law and a few of the sites that were started in California shut down.

The National Voting Rights Institute and the American Civil Liberties Union of Southern California then filed a lawsuit on behalf of one of the websites, votexchange2000, saying vote-swapping was protected under the First Amendment.

A federal appeals court in California agreed with them in 2007, ruling that vote-swapping is protected under the Constitution.

“The Web sites did not encourage the trading of votes for money, or indeed for anything other than other votes,” the circuit court said in its decision.

The ACLU said in a prophetic statement at the time that this would be significant in future elections.

“The decision will be an important precedent protecting the right of Web site operators and voters to maintain and use such sites in future presidential elections.”