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Scott聽Walker聽abandoned his bid for the Republican presidential nomination on Monday, exiting the race that saw him rise to front-runner and fall to afterthought in a matter of months.

The Wisconsin governor gave a news conference for Monday evening in Madison, where he announced he will be the second major GOP candidate to quit the race.

"Today, I believe that I am being called to lead by helping to clear the field in this race so that a positive conservative message can rise to the top," said Walker. "I encourage other Republican presidential candidates to consider doing the same so the voters can focus on a limited number of candidates who can offer a positive conservative alternative to the current front-runner."聽

"It has been communicated to me that he is getting out of the race," said Iowa state Sen. Brad Zaun, who endorsed聽Walker聽earlier this year. "I'm proud of our efforts in Iowa. And I think he's an incredible candidate. It's unfortunate."

One of the last Republicans to enter the race,聽Walker聽joined former Texas Gov. Rick Perry as one of the first to leave it, having been unable to adjust to the popularity of billionaire businessman Donald Trump or break out in either of GOP's first two debates.

He will return to his job in Wisconsin as governor, where his term runs through 2018.

"I'm not sure what went wrong," said Iowa state Sen. Mark Costello, who endorsed聽Walker聽earlier this year. "I think all the more provocative statements some of the candidates made got them more press.

"I don't think he made any really big mistakes," Costello said, "but people lost enthusiasm."

Walker tried to appeal to religious conservatives, tea party conservatives, and the more traditional GOP base. He tried to cast himself as an unintimidated conservative fighter who had a record of victories in a state that hasn't voted Republican for president since 1984.

He came to the race having won election in Wisconsin three times in four years, and having gained a national following among donors and conservatives by successfully pushing his state to strip union bargaining rights from its public workers.

Walker聽pointed to those Wisconsin wins, in a state that twice voted for Barack Obama as president, as signs that he could successfully advance a conservative agenda as the GOP's White House nominee.

He called himself "aggressively normal" and campaigned on a Harley-Davidson motorcycle, and made a splash in January with a well-received speech before religious conservatives in Iowa.

Groups backing聽Walker聽went on to raise $26 million, tapping wealthy donors whom聽Walker聽had cultivated in his years as governor and during his successful effort to win a recall election in 2012.

But聽Walker's聽fall was dramatic. He was unable to adjust to Trump's rise and repeatedly had trouble clearly stating his position on several issues.

He took days to clarify whether he supported ending birthright citizenship. He initially showed interest in building a wall between the U.S. and Canada, only to later laugh it off as ridiculous.聽Walker聽also declared he wasn't a career politician, despite having held public office for 22 straight years.

After Trump, Ben Carson and Carly Fiorina displaced聽Walker聽at the top of the polls,聽Walker聽took a more aggressive approach, promising to "wreak havoc" on Washington. He vowed to take on unions as president, just as he did as Wisconsin governor, outlawing them for federal government workers and making the entire country right-to-work.

But the anti-union policy proposal fell flat; announced in the days before the second GOP debate, it wasn't mentioned at all 鈥� by聽Walker聽or anyone else 鈥� on stage.

While only Texas Sen. Ted Cruz and former Florida Gov. Jeb Bush had more super PAC money available to boost their chances in the original 17-person 2016 Republican field,聽Walker聽struggled to generate money for his official campaign.

He has yet to report fundraising totals to federal regulators, but top fundraisers and donors have said his plummeting poll numbers left them struggling to generate cash.

Walker聽called his senior staff to the governor's mansion in Madison on Monday to review recent polling, in which he was mired at the bottom of the GOP field, and his campaign's finances.

"I'm disappointed," said Stanley Hubbard, a billionaire media mogul from Minneapolis who had backed聽Walker'scampaign. "He's a good man and would have been a good president."

As word spread of his decision to exit the race, Republican operatives in Iowa working for other campaigns were already making plans to contact state lawmakers who had committed to support聽Walker.

The Wisconsin governor had assembled a campaign organization in every one of Iowa's 99 counties and had a number of state lawmakers committed to him.

Walker, one of the most divisive political figures in Wisconsin history, will have some work to do repairing his relationship with voters in his home state. His job approval ratings fell dramatically during his presidential run, hitting their lowest mark ever of 39 percent in an August poll conducted by Marquette University.

Wisconsin state Assembly Speaker Robin Vos, a Republican and close ally of聽Walker's, said he "has an amazing story to tell about Wisconsin and the reforms we put into place."

But Vos said he suspects聽Walker聽realized he would have had a difficult time taking attention away from other candidates, like Trump, who are "sucking up a lot of the oxygen."

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Bykowicz reported from Washington.

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