The 36-year-old Charleston lawyer would hold the seat until November. That's when the governor wants general election voters to decide who will serve the final two years of Byrd's term. The Legislature has begun a special session to consider a proposal from Manchin to allow for a fall vote.
Byrd was the longest-serving senator in history when he died last month at 92. Goodwin, the youngest among those considered potential choices, worked on Manchin's 2004 campaign for governor before becoming his chief lawyer. He served in that post until shortly after Manchin began his second term in 2009, leaving for his family's law firm.
When sworn in next week, Goodwin will become the youngest sitting senator, according to the Senate historian's office. The next youngest, Sen. George LeMieux of Florida, is 41 and the average age of senators is 66.
"We passed this torch to another generation," Manchin said. "I have been pushing young people to get involved in public service. We have passed that torch."
Last year, Manchin tapped Goodwin to lead an extensive review of the state's judiciary amid complaints from business groups and conflict-of-interest scandals involving state Supreme Court justices. Retired U.S. Supreme Court Justice Sandra Day O'Connor served as the study commission's nonvoting honorary chair.
While Manchin's general counsel, Goodwin was considered key in drafting mine rescue and safety measures passed after fatal accidents at West Virginia's Sago and Aracoma coal mines in early 2006.
The governor's former longtime chief of staff, Larry Puccio, credited Goodwin for his role in that legislation as well as such other major administration policies as the conversion of the state's troubled workers' compensation program into a private insurance company.
"He's just a brilliant attorney, and I think he's very detailed and a disciplined individual," said Puccio, who had also been considered a potential Manchin pick. "I think he's a rising star, and West Virginians would do well if they involved such individuals in the process. I think so much of him."
Goodwin was accompanied to Friday's announcement by his wife and son, and his extended family, which includes an uncle who is a federal judge, a cousin who is the U.S. attorney for the state's southern federal court district, and an aunt who is the state's secretary for arts and education.
Goodwin already has ties to West Virginia's Senate delegation: His wife, Rochelle, is state director for Sen. Jay Rockefeller, Byrd's Democratic colleague.
Rockefeller said Goodwin should not be considered an interim senator.
"He is a United States senator. Pure and simple. Robert C. Byrd would want that known," Rockefeller said.
Goodwin will represent the 60th vote in the Democratically controlled Senate, and that will allow the body to pass unemployment compensation legislation, he said.
The state Chamber of Commerce, which had urged Manchin to fill in for Byrd, welcomed Friday's choice.
"Anybody who knows Carte likes Carte, enjoys working with him and finds him extremely competent," Chamber President Steve Roberts said. "He is somebody who will represent West Virginia well in Washington and make us proud."
The state's Republican Party chairman, Doug McKinney, said the GOP was interested in Manchin's choice only as long as he was "intelligent and someone from West Virginia to represent us until then."
The governor's appointee is not expected to run for the seat. Manchin has said it's highly likely he will, but he has yet to announce his plans. The GOP's top choice is Rep. Shelley Moore Capito, though she is already seeking a sixth House term.
The likely special election will put another Democratic Senate seat in play this year as the party struggles to retain its majority. Democrats have a 58-41 edge, with Byrd's seat vacant, but are expected to lose seats in November, typical for the president's party in his first midterm elections.
State Senate passes bill to set up special election
CHARLESTON, W.Va. (AP) -- The West Virginia Senate has passed its version of Gov. Joe Manchin's proposal for holding an election for the seat held by the late U.S. Sen. Robert C. Byrd.
Friday's 29-1 vote advances a measure setting an Aug. 28 special primary and then adding the seat to the Nov. 2 general election. The Senate suspended its rules to allow for early passage.
The bill goes to the House, where delegates earlier amended their version of the governor's proposal.
The Nov. 2 winner would take office that month and serve out the 26 months that would remain in Byrd's term.
Manchin says it's likely he'll run for the seat. He plans on Friday to unveil an appointee to serve until November.