The plan failed. Washington Secretary of State Kim Wyman imposed fines of $1,000 on each elector for breaking their vow to honor the will of voters.
In arguments before the state Supreme Court in Olympia on Tuesday, the trio's lawyer, Harvard Law professor Lawrence Lessig, argued that the fines violated their First Amendment rights. The nation has a long history of having electors vote their conscience, he said, and never before has one been fined for doing so.
"The question for this court is not whether they were right; the question is whether they had a right," Lessig told the justices. "If they have a constitutional freedom, then they can't be fined for exercising that freedom."
The electors unsuccessfully asked a federal court to block the state from fining them. The court found that federal law does not give electors absolute freedom to vote for the candidates of their choice, and the 9th U.S. Circuit Court of Appeals denied their request for an emergency order.
On Thursday, the 10th Circuit Court of Appeals will hear arguments in a similar case concerning Colorado elector Michael Baca. He saw his vote discarded under state law because he wrote in the name of then-Ohio Gov. John Kasich instead of Clinton.
Voters in the U.S. do not directly vote for a president and vice president. Instead, they vote for a slate of electors who pledge to cast their votes for their party's nominee through the Electoral College.
While the Constitution gives states the power to appoint electors, the debate centers on whether the states can control how the electors vote.
An attorney for Washington state, deputy solicitor general Callie Castillo, told the state Supreme Court that the electors did not have a free-speech interest in how they cast their vote. But, she said, the state does have an interest in ensuring the will of the people is honored.
"Nothing in the Constitution prevents the state from placing conditions on presidential electors and then holding them to those conditions," the state wrote in a brief. "And no court — anywhere — has adopted petitioners' view that presidential electors have a First Amendment right to cast their ballots free of influence by the state."
John, an administrative assistant at her Quaker church in Seattle, said she had no qualms about taking action to oppose Trump in the Electoral College, even if it meant voting for someone who didn't win the popular vote in Washington.
"I knew that he wasn't qualified, that he had said horrible things about women," she said. "I thought maybe we could get some Republican electors to come on our side."
The justices did not indicate how soon they would rule.