If liberal activists believe their fury means Sen. Susan Collins, R-Maine, will think again before toeing the GOP line next time, the indications are they are wrong.

"Bribery does not work on Senator Collins. Extortion does not work on Senator Collins," Annie Clark, a Collins spokeswoman, told the Washington Examiner in response to questions about her dramatic decision to to confirm Judge Brett Kavanaugh last Friday.

"And anybody who thinks these tactics would work on Sen. Collins obviously doesn’t know her. Sen. Collins made up her mind based on the merits of the nomination. Threats or other attempts to bully her did not play a factor in her decision-making whatsoever."

The defiant comments by her staff suggest that anti-Kavanaugh rage, before and after her dramatic vote last Friday, could have rebounded. A top Republican strategist in the Senate said it would make her more determined to be re-elected in 2020 because "her will to win is among the fiercest in the chamber".

After the final vote on Kavanaugh Saturday, Collins retreated to her home state and has felt the weight of her decision in the form of praise from Republicans and anger from Democrats.

Collins explained her position over the weekend in a series of national and local interviews, insisting that the reaction back home has been "overwhelmingly positive," including at a Sunday event in the state to honor a fallen police officer.

"Many people have thanked me for my vote and have said that they were very pleased that I did the right thing," Collins said in a statement to the Washington Examiner.

[Opinion: Susan Collins gave Senate Democrats the scolding they deserve]

According to a source close to the Maine Republican, Collins remains "resolute" and stands by her vote despite increased safety concerns.

In recent days, protesters have gathered at her home and still picket her Senate offices. In recent weeks, Collins has had a Capitol Police detail by her side while traveling around Washington. During her interview with "60 Minutes" on CBS Sunday, host Scott Pelley noted that she arrived surrounded by officers, who have followed her back in the state.

"It's been very difficult," Collins told Pelley. "I've had the honor of serving in the Senate for nearly 22 years, and this is as ugly a situation as I've ever seen in that time ... I have had to have security because of threats against me and family members and staffers, and this has been unlike anything I've ever been through."

Nevertheless, Collins stands by her decision — the latest in a long line of high-profile votes she's made as a centrist lawmaker. Last year, she was one of three Senate Republicans to vote against a "skinny" repeal of the Affordable Care Act, endearing her to Democrats and liberals. Then she voted for the tax cut package in December, drawing Democratic ire once more.

The source close to Collins also noted that her controversial votes have dated back to the late 1990s when she voted to acquit President Bill Clinton in the Senate trial following his impeachment — inflaming her own party in the process.

"Many at the time said that would be the end of her political career," the source said, suggesting that Democratic hopes that she will be defeated in 2020 will be tough to fulfill.

There is no question, however, that her Kavanaugh vote has energized her opponents on the Left. A CrowdPac effort has raised $3.6 million for her eventual challenger in 2020. The effort raised $2 million before Collins revealed her decision, which Collins said amounted to "bribery" as she worked her way through the decision process.

Senate Majority Leader Mitch McConnell, R-Ky., took a moment this weekend to thank the protesters, who have also taken to the street outside his house on Capitol Hill, saying they helped solidify the conference's support for Kavanaugh.

“The tactics that were used completely backfired ... Harassing members at their homes, crowding the halls with people acting horribly, the effort to humiliate us really helped me unify my conference. So I want to thank these clowns," McConnell told The New York Times, adding Monday that members were "literally under assault" from the crowds of protesters.

Their presence has been a constant theme throughout her deliberation process, having met with scores of them in her Capitol Hill office.

According to the Washington Post, her office in Portland, Maine, has also been inundated with protesters, with some groups delivering hangers painted red — a warning of what they believe what could happen if Roe v. Wade is overturned. Some have recently left cardboard penis cutouts reading “F---You and the donor class you rode in on" at the office."

Democrats — and the $3.6 million bookmarked for that candidate — are searching for a credible challenger, headlined by Susan Rice, the national security adviser and U.N. ambassador under President Barack Obama. Rice said she will look into a possible candidacy, but Collins already started knocking the former top Obama aide over the weekend.

She told CNN that Rice "pleaded" for the Maine Republican to introduce her to the Senate Foreign Relations Committee after being nominated for her ambassadorship, adding that she doesn't live in the state.

"Democrats are deluding themselves if they think they can defeat her," said the Republican Senate strategist, when asked for a candid assessment of the chances to knock off Collins. "Not only would Susan Collins from Maine annihilate Susan Rice from Washington, she'd probably win by her best margin ever."

"Anybody who watches the Senate closely knows that her will to win is among the fiercest in the chamber. And anybody with a basic understanding of Maine knows their voters would take pride in picking a local girl who graduated from a local public high school over a D.C. prep school elitist they've never met."

Kavanaugh is slated to begin sitting on the high court on Tuesday after his ceremonial swearing into office slated for 7 p.m. in the East Room of the White House. Collins, however, will be traveling back from Maine then and will not be in attendance.