Democratic presidential hopeful Tom Steyer Tom SteyerTV ads favored Biden 2-1 in past month Inslee calls Biden climate plan 'perfect for the moment' OVERNIGHT ENERGY: Trump administration finalizes plan to open up Alaska wildlife refuge to drilling | California finalizes fuel efficiency deal with five automakers, undercutting Trump | Democrats use vulnerable GOP senators to get rare win on environment MORE scored an endorsement from key New Hampshire political activist Dudley Dudley on Tuesday, marking his first endorsement in the Granite State.

Dudley, who endorsed Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) ahead of the 2016 Democratic presidential primary, said she believes Steyer is the only candidate who can beat Trump in November, according to a CBS News reporter.

Her official endorsement came shortly after she accompanied Steyer to file for the state's primary.

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Steyer entered the Democratic race in July and has since struggled to gain traction in the polls. He has also been viewed as a target of some progressives, who point to his status as a billionaire as a potential flaw.

The longtime activist addressed her decision to not endorse Sanders at a campaign event for Steyer in New Hampshire on Tuesday, telling attendees, "This is not his year."

She also commented on Sanders's fellow progressive Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.), saying she is "fantastic" but can't win, according to an NBC News reporter.

Dudley has a long history in New Hampshire Democratic politics, serving in the state's House of Representatives from 1972 to 1976.

She later launched the 1980 Draft Kennedy campaign, urging then-Sen. Ted Kennedy (D-Mass.) to challenge former President Carter.

Dudley unsuccessfully endorsed Paul Tsongas over former President Bill Clinton William (Bill) Jefferson ClintonHarris: Ginsburg 'absolutely' cleared the path for me Anxious Democrats amp up pressure for vote on COVID-19 aid Barr's Russia investigator has put some focus on Clinton Foundation: report MORE in 1992 and threw her support behind former President Obama's campaign in 2008. Obama ended up losing New Hampshire to 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 in 2008 but went on to win the presidency that same year.