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Democratic U.S. Senator from West Virginia will not seek re-election

John D. Rockefeller IV (D - WV)

(CNN) — Sen. John D. Rockefeller IV, the five-term Democrat from West Virginia, announced Friday he will not run for re-election in 2014, opening up a potential seat for Republicans to grab in the next round of Congressional contests.

“As I approach 50 years of public service in West Virginia, I’ve decided that 2014 will be the right moment for me to find new ways to fight for the causes I believe in and to spend more time with my incredible family,” Rockefeller said in a statement.

“Championing those most in need has been my life’s calling, and I will never stop fighting to make a difference for the people who mean so much to me,” he continued.

First elected in 1984, Rockefeller is the chairman of the Commerce, Science, and Transportation Committee, and also holds a seat on the select intelligence, taxation, and veterans’ affairs panels.

His great-grandfather was the oil billionaire John D. Rockefeller, who at one point was America’s richest man, and other relatives played major roles in the American banking and philanthropic communities.

“Jay Rockefeller first arrived in West Virginia as a young volunteer, eager to improve the lives of working families. And for more than four decades, he has continued to fight tirelessly on their behalf,” said President Barack Obama in a statement, praising his “impressive” legacy advocating for education, miners’ safety, Social Security, and affordable healthcare. “Michelle and I join the people of West Virginia in thanking Senator Rockefeller for a lifetime of service.”

Republican Rep. Shelley Moore Capito, the seven-term West Virginia congresswoman, announced in November she would run for Rockefeller’s seat in 2014.

“The Senate has been stalemated – hasn’t made progress and I believe I can contribute to moving forward, working together and solving the problems and I think it’s a great opportunity for our state quite frankly,” Capito said in her announcement at the state capitol in Charleston, according to CNN affiliate WSAZ.

Capito represents West Virginia’s second congressional district, which stretches from the panhandle outside Washington, D.C., west to the state capital of Charleston. She was first elected in 2000.

While West Virginia’s two senators are Democrats, and its governors have been Democrats since 2001, the state has long voted for Republicans in presidential elections. A Democratic source acknowledged Friday that their bench of potential candidates for Rockefeller’s seat wasn’t deep.

Sen. Michael Bennet, the Colorado Democrat who chairs the Democratic Senatorial Campaign Committee, was optimistic in a statement, writing he was “confident we can elect an independent-minded Democrat to [Rockefeller's] seat next November.”

“Democrats maintain nearly a two to one voter registration advantage over Republicans in West Virginia and I know there are a number of leaders there who will consider taking this next step to serve their state,” Bennet said.

Democrats currently hold a 54-45 majority in the Senate. One independent senator – Sen. Angus King of Maine – also caucuses with Democrats. Thirty-five Senate seats will be open for re-election in 2014 — Democrats will be defending 21 of them, while Republicans will defend 14.

CNN’s Sam Feist and Paul Steinhauser contributed to this report.

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