Sen. Susan Collins Susan Margaret CollinsThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Billionaire who donated to Trump in 2016 donates to Biden Credit union group to spend million on Senate, House races MORE (R-Maine) says she has not decided whether to run for reelection, suggesting “dark money groups” have hurt her chances.

“The divisiveness of our country and the unceasing attacks by dark money groups in Maine have clearly had an impact,” Collins told Bloomberg in a recent interview.

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“But I believe that once Mainers really focus on the race and we remind them of my being the No. 1 most bipartisan member of the Senate, and all the accomplishments that I can point to that have directly benefited the state, I’ll be fine,” she added.

Collins, who was reelected with two-thirds of the vote in 2014, was one of the most popular senators in her home state in 2015, with an approval rating of 78 percent.

That approval rating has since dropped to 45 percent, making her the second-least popular after Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellTrump 'no longer angry' at Romney because of Supreme Court stance On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline The Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power MORE (R-Ky.).

Collins’s decisive vote to confirm Supreme Court Justice Brett Kavanaugh Brett Michael KavanaughTrump faces tricky choice on Supreme Court pick The Hill's 12:30 Report: Trump stokes fears over November election outcome The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' MORE in 2018 made her one of the top targets for Democrats, who face an uphill climb to a Senate majority in the 2020 map.

Several Democrats have already announced a run against her next year, including Maine House Speaker Sara Gideon and attorney Bre Kidman, as well as Betsy Sweet, former director of the Maine Women’s Lobby, who lost in the 2018 Democratic primary for governor to Gov. Janet Mills.

Collins told Bloomberg she has overcome unfavorable odds in the past.

“In 2008, which was another very tough race where [Senate Minority Leader] Chuck Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE [D-N.Y.] had his top pick in a very capable congressman, a very worthy opponent in Tom Allen, at one point that was a 7-point race and I ended up winning by 20,” she said.