With the submission of the 10,000 signatures required to join the ballot, former military prosecutor John Deaton has made his bid to unseat U.S. Senator Elizabeth Warren official.

I misspoke: 11,873 Certified Signatures.

Bad news for one of Washington’s most entrenched career politicians.

⁦@ewarren⁩: Look who’s on the ballot! pic.twitter.com/vmySVEwUJW

— John E Deaton (@JohnEDeaton1) May 13, 2024

Deaton, a retired U.S. Marine who moved to the Bay State from Rhode Island earlier this year but is originally from Detroit, Michigan, announced his intention to run against Warren in February. On Monday he was in the Secretary of the Commonwealth’s Elections Division offices to deliver 11,873 certified signatures to state officials.

“Today our campaign takes the next step towards retiring Elizabeth Warren and restoring Massachusetts’ voice in the Senate. I’m grateful to our volunteers and supporters who share my enthusiasm to challenge the political elites and bring commonsense back to Washington, D.C.,” Deaton told the Herald.

Now a resident of Swansea, a mesothelioma lawyer and cryptocurrency advocate, 56-year-old Deaton has described himself as unique among politicians, citing his impoverished upbringing and his service in the Marine Corps.

He joins a race that’s likely include a competitive primary, with the 74-year-old Warren seen as potentially vulnerable in an election cycle coinciding with what will almost certainly be a high-participation presidential contest.

Quincy City Council President Ian Cain has also announced his intention to seek the GOP nomination.

It’s official – I’m running for the United States Senate! It’s time to usher in a new generation of leadership – where leaders embrace the innovation economy and the new digital world, where they focus on collaboration instead of divisiveness, and where they strive for results,… pic.twitter.com/XKzCV6BMbc

— Ian Cain (@ichuckcain) April 24, 2024

Warren, as of now, faces no opposition on the left as she seeks a third term.