LINCOLN, Neb. (AP) -- U.S. Sen. Mike Johanns of Nebraska announced Monday that he will not seek re-election in 2014, saying he wants a "quieter time" to focus on his family following a busy political career that included stints as governor and President George W. Bush's agriculture secretary.
The Nebraska Republican announced that he was retiring from the Senate after one term. He said he and his wife, Stephanie, had decided that the time had come to end a public career that has spanned more than half of his life.
In an interview, Johanns said he and his wife -- a former state lawmaker -- had endured a combined 16 primary and general-election campaigns together. They held eight different offices over the course of 32 years.
"That's enough," Johanns said. "We just felt, both Steph and I, that it was time. That's really what we talked most about. We always said we'd know when it was time. And it was time."
Johanns, 62, joined the U.S. Senate in 2009 and did not appear to face any re-election threat. He served as agriculture secretary under Bush and was Nebraska's governor from 1999 to 2005.
Johanns faced a health scare during his first year as a senator, undergoing surgery in March 2009 after doctors found a spot on his left lung. No cancer was found, but doctors removed the lower left lobe of his lung as a precaution. Johanns was a smoker but quit more than 20 years ago.
His announcement came as a surprise to many GOP insiders. Several Republican office-holders praised Johanns for his collegiality and thoughtfulness in a deeply divided Washington. Johanns was a member of the "Gang of Eight" that tried to negotiate a federal deficit-reduction deal in 2011.
"I am personally grateful for Mike's leadership in the Senate and all he has done in helping to smooth my transition," said U.S. Sen. Deb Fischer, a Republican who was sworn in for her first term in January. "His rare mix of strong leadership and warm collegiality has earned him the respect and admiration of his colleagues on both sides of the aisle. While I am fortunate to have two more years to serve alongside him, I am sad to see Mike leave the Senate."
Johanns' decision to retire opens a new 2014 race in Nebraska, a solidly red state where Republicans hold all the congressional seats.
His departure could leave an opening for Republican Gov. Dave Heineman, who is leaving office in 2015 because of term limits. Republican U.S. Reps. Jeff Fortenberry and Lee Terry of Nebraska have also been mentioned as a possible candidate.
Heineman was courted by national party officials after Democratic U.S. Sen. Ben Nelson announced in 2011 that he was retiring. But Heineman declined to enter the race at the time, saying he wanted to focus on his work as governor.
Heineman, who served as Johanns' lieutenant governor, called the U.S. senator "a remarkably outstanding public official."
In a press conference Monday afternoon, Heineman said he'd consider running for the soon-to-open seat. Heineman said Johanns called him Monday morning to notify him of his decision, and Heineman -- who spent most of the day traveling -- hadn't had time to discuss a possible run with his family.
"It's only appropriate to think about it," Heineman said. "But again, I just don't want everybody jumping to conclusions. That would be totally inappropriate."
Although he began his political career as a Democrat, Johanns has made a name for himself as a staunch conservative since his election to the Senate in 2008.
In his first year in the Senate, Johanns voted with the GOP 94 percent of the time, including opposing the confirmation of Supreme Court Justice Sonia Sotomayor. He opposed the 2010 health care reform law championed by President Barack Obama, calling it bad policy even after the U.S. Supreme Court in 2012 upheld it as constitutional.
But unlike many Republicans, including Fischer, Johanns publicly backed former U.S. Sen. Chuck Hagel for secretary of defense.
In 2012, when it was revealed that the Environmental Protection Agency was using aerial surveillance to check farms in the Midwest for violations of federal clean water regulations, Johanns introduced an amendment to a multifaceted farm bill to stop the flights, but it fell four votes short of the 60 needed.
He began his foray into politics nearly three decades ago, when he was elected as a Democrat to the Lancaster County Board of Supervisors in southeast Nebraska. He switched parties in 1988, winning election as a Republican to the Lincoln City Council and, three years later, the city's mayor.