Rep. Shelley Moore CapitoShelley Moore CapitoLive coverage: The Senate's 'vote-a-rama' Overnight Tech: Tech listens for clues at Sessions hearing | EU weighs expanding privacy rule | Senators blast Backpage execs Dem Manchin lauds Trump’s EPA pick MORE (R-W.Va.) will announce her bid for Democratic Sen. Jay RockefellerJay RockefellerObama to preserve torture report in presidential papers Lobbying world Overnight Tech: Senators place holds on FCC commissioner MORE's seat on Monday, according to the West Virginia Metro News.

The seven-term congresswoman declined to run against Democratic Sen. Joe ManchinJoe ManchinWarren blasts Trump for John Lewis criticism Dems prepare to face off with Trump's pick to lead EPA Manchin: Republicans should learn from Dems' ObamaCare mistakes MORE this year but is considered a strong contender for the seat.

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The 75-year-old Rockefeller is currently in his fifth term, and could retire, though he has not yet announced his plans for the upcoming cycle. He's won nearly all of his elections with sizable margins.

Her Senate bid means that Capito's 2nd District seat will be open in 2014.