Sara Gideon, the Democratic Speaker of the Maine House of Representatives, announced on Monday that she would seek her party’s nomination to challenge 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) for her seat.

Gideon is among the highest-profile Democrats to enter the Maine Senate race so far. She was widely expected to announce her campaign after the close of Maine’s first legislative session of 2019, which ended last week.

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“Susan Collins has been in the Senate for 22 years. And at one point maybe she was different than some of the folks in Washington, but she doesn’t seem that way anymore,” Gideon said in a video announcing her Senate bid.

She pointed to Collins’s vote in favor of the Tax Cuts and Jobs Act, the 2017 Republican tax overhaul “where almost all of the benefits went to corporations and the wealthy.”

“And Susan Collins’s vote to put 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 on the Supreme Court may be paying off for her, but it’s put women’s control of their own health care decisions in extreme jeopardy,” said Gideon, who has served in the Maine House since 2012.

Collins, who has been in the Senate since 1997, is a prime target for Democrats in 2020. Her vote last year to confirm Kavanaugh to the Supreme Court as he faced sexual misconduct allegations angered liberals and prompted an intense effort to recruit candidates to challenge the longtime senator.

Gideon’s announcement follows the passage of a flurry of progressive bills in the Maine Legislature, including a measure that allows health care professionals who are not physicians to perform abortions. Gov. Janet Mills (D) signed that bill into law earlier this month.

Gideon isn’t the only Democrat vying to take on Collins next year. Betsy Sweet, who unsuccessfully sought the Democratic nomination for Maine governor in 2018, is also in the Senate race. Saco, Maine, attorney Bre Kidman is also running.