Sen. Heidi Heitkamp (D-N.D.) was prepared to vote to confirm Supreme Court Justice Brett Kavanaugh Brett Michael KavanaughHarris faces pivotal moment with Supreme Court battle Poll: 59 percent think president elected in November should name next Supreme Court justice Feinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight MORE but decided not to after watching his hearing in front of the Senate Judiciary Committee last month, she said in an interview that aired Monday.

Heitkamp, who was considered a swing vote in Kavanaugh's confirmation process, told CNN that she had her office "begin to prepare a statement saying I was voting for him, up until that hearing.”

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Heitkamp said she watched Christine Blasey Ford's hearing, then Kavanaugh's and then Kavanaugh's for a second time, with the sound off.

"We communicate not only with words, but with our body language and demeanor," she said.

"I saw somebody who was very angry, who was very nervous, and I saw rage that a lot of people said, 'Well of course you're going to see rage he's being falsely accused,' but it is at all times you're to acquit yourself with a demeanor that's becoming of the court," Heitkamp added.

Heitkamp said the final straw came when Kavanaugh responded to Sen. Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Minn.) asking him if he had ever blacked out from drinking by asking her the same question.

Kavanaugh on Saturday was confirmed to the Supreme Court by a 50-48 vote in the Senate.

Heitkamp also said she believed Ford, who accused Kavanaugh of sexually assaulting her, because of her experience as an attorney working with sexual assault victims.

"I certainly think I have expertise beyond a number of people within the United States Senate and that expertise is that I have sat across the desk with victims people I've believed when they told me their story, and I had to say, 'I believe you but these cases can't be proved beyond a reasonable doubt so we can't proceed with the prosecution," she said.

Heitkamp, who is one of 10 Senate Democrats up for reelection in states that President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE won in 2016, is considered particularly vulnerable ahead of November's midterms. Recent polling has shown her trailing challenger Rep. Kevin Cramer (R-N.D.) by a double-digit margin.