After failing to unseat Sen. Elizabeth Warren, Marine veteran and lawyer John Deaton is now the first Republican to launch a run for Sen. Ed Markey ’s seat, he announced at an event in Worcester Monday night.

“Our leaders should be doing their jobs to help Massachusetts families, but they’re all career politicians, and they’re failing,” Deaton says in a new campaign video , as Warren, Markey, and Markey primary challenger Rep. Seth Moulton span the screen.

Deaton, a cryptocurrency advocate and personal injury lawyer, was a political newcomer when he launched a bid against Warren last year. While she pulled comfortably ahead of him last November, Deaton made up some ground after two testy debates between the candidates.

Republican candidates for governor joined Deaton’s party a

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