Sen. Susan Collins Susan Margaret CollinsDemocratic senator to party: 'A little message discipline wouldn't kill us' Poll: 57 percent of Americans think next president, Senate should fill Ginsburg vacancy On The Trail: Making sense of this week's polling tsunami MORE’s (R-Maine) approval rating is deeply underwater about a year ahead of her reelection race, according to a new poll from the left-leaning firm Public Policy Polling.

Thirty-five percent of Maine voters polled approve of the job Collins is doing, while 50 percent disapprove. Collins trails a generic Democratic candidate 44 percent to 41 percent in the 2020 Maine Senate race, a drop from September, when she led a generic Democrat 44 percent to 38 percent.

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Collins, who is one of two Republican senators running for reelection in states former Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonBloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE won in 2016, is facing one of the toughest reelection campaigns of her career. Her vote last year to confirm Supreme Court Justice Brett Kavanaugh Brett Michael KavanaughTrump plans to pick Amy Coney Barrett to replace Ginsburg on court Collins trails challenger by 4 points in Maine Senate race: poll SCOTUS confirmation in the last month of a close election? Ugly MORE as he faced sexual misconduct allegations infuriated liberals and sparked an intense effort to recruit candidates to challenge the longtime senator.

“At one point, maybe Senator Collins was different, but she doesn’t seem that way anymore: taking over a million dollars from drug companies and the insurance industry and voting to put Brett Kavanaugh on the Supreme Court. I’m running for Senate because I know I can make a difference, and because Mainers deserve a senator who will always put our state first,” Maine House Speaker Sara Gideon, her chief Democratic challenger, said in her campaign announcement.

Collins also faces a precarious situation regarding Democrats' impeachment investigation. She has not weighed in on the probe, saying she declines to comment since she would be a juror if the House decides to ultimately impeach the president.

While 53 percent of Mainers in the poll support impeachment, only 14 percent of Republican primary voters said the same.

“It’s going to be hard for Susan Collins to get reelected if she opposes impeachment,” said Dean Debnam, president of Public Policy Polling. “She’s already lost a lot of her crossover support from Democrats, and that would cause her to lose even more.”

“It’s going to be hard for Susan Collins to get reelected if she supports impeachment,” added Debnam. “Donald Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE is still overwhelmingly popular with Republican primary voters, and they’re going to be inclined to put Collins out in the primary if she votes to remove him from office.”

However, the National Republican Senatorial Committee dismissed the poll, pointing to Public Policy Polling's political leanings.

“Public Policy Polling (PPP) is an arm of the Democratic Party, and their manufactured 'polls' are not worth the paper they’re printed on. Washington special interests are trying to distract while their handpicked candidate, Sara Gideon, faces ongoing ethics investigations, criticism for refusing to talk to the media or voters, and her ties to dark money organizations,” NRSC spokesperson Nathan Brand said in a statement.

Collins has proved resilient throughout her career, having stayed in the Senate since she was elected in 1996.

The Cook Political Report, a nonpartisan election handicapper, rates the Maine Senate race as a “toss up.”

The Public Policy Polling survey interviewed 939 Maine voters from October 11-13 and has a margin of error of plus or minus 3.2 percentage points.