Rep. Shelley Moore CapitoShelley Moore CapitoRepublicans face divisions over ObamaCare repeal High out-of-pocket prescription drug cost: the patient perspective GOP senators avoid Trump questions on rigged election MORE (R-W.Va.) will announce her bid for Democratic Sen. Jay RockefellerJay RockefellerLobbying world Overnight Tech: Senators place holds on FCC commissioner Overnight Tech: Senate panel to vote on Dem 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 ManchinOvernight Energy: Walden wins Energy gavel | Trump looks at Dems to head Energy, Interior Trump considering Dem senator for Energy secretary: report Red-state Dems face tough votes on Trump picks 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.