DENVER (CBS4) – There was some drama at the state Capitol on Monday afternoon when one elector had to be replaced after refusing to vote for Democratic presidential nominee Hillary Clinton.

That elector was replaced and all nine electors in Colorado voted for Clinton.

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Democratic presidential nominee Hillary Clinton speaks during the third and final US presidential debate with Republican nominee Donald Trump at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on Oct. 19, 2016. (credit: PAUL J. RICHARDS/AFP/Getty Images)

Democratic presidential nominee Hillary Clinton speaks during the third and final US presidential debate with Republican nominee Donald Trump at the Thomas & Mack Center on the campus of the University of Las Vegas in Las Vegas, Nevada on Oct. 19, 2016. (credit: PAUL J. RICHARDS/AFP/Getty Images)

There was a loud response by the crowd, including boos and chants when this happened.

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Earlier, a judge overruled the challenge to the electors’ oath and while they took the oath, two said they were signing the oath under “duress.”

Republican presidential nominee Donald Trump listens to Democratic presidential nominee former Secretary of State Hillary Clinton speak during the third U.S. presidential debate at the Thomas & Mack Center on October 19, 2016 in Las Vegas, Nevada. Tonight is the final debate ahead of Election Day on November 8. (Photo by Win McNamee/Getty Images)

Republican presidential nominee Donald Trump listens to Democratic presidential nominee former Secretary of State Hillary Clinton speak during the third U.S. presidential debate at the Thomas & Mack Center on October 19, 2016 in Las Vegas, Nevada. Tonight is the final debate ahead of Election Day on November 8. (Photo by Win McNamee/Getty Images)

There has been an effort to persuade Colorado’s nine electors to join a long-shot bid to block Republican President-elect Donald Trump.

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Democrat Hillary Clinton won Colorado. But some of Colorado’s nine electors have said they may join a protest effort to try to stop Trump from collecting the 270 electoral votes he needs to win. Analysts call the effort nearly impossible.