Rep. Shelley Moore CapitoShelley Wellons Moore CapitoOvernight Energy & Environment — Presented by Climate Power — Senate Democrats ding Biden energy proposal Capito grills EPA nominee on '#ResistCapitalism' tweet GOP senators unveil bill designating Taliban as terrorist organization MORE (R-W.Va.) will announce her bid for Democratic Sen. Jay RockefellerJohn (Jay) Davison RockefellerHumorless politics a sad sign of our times Bottom Line World Health Day: It's time to fight preventable disease MORE's seat on Monday, according to the West Virginia Metro News.

The seven-term congresswoman declined to run against Democratic Sen. Joe ManchinJoe ManchinBriahna Joy Gray: Push toward major social spending amid pandemic was 'short-lived' Overnight Energy & Environment — Presented by Climate Power — Emissions heading toward pre-pandemic levels Biden discusses agenda with Schumer, Pelosi ahead of pivotal week 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.