Republican Jeb Bush survives debate with steady performance

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Fourth GOP Debate Winner and Loser

A steadfast performance by Jeb Bush in Tuesday's Republican debate has halted the sense of desperation around his U.S. presidential campaign and may buy him time to counter the rise of chief rival Marco Rubio.

The fourth Republican debate in the search for a 2016 presidential nominee was characterized by a steady stream of attacks against front-runner Donald Trump and mistake-free performances by Rubio of Florida and Ted Cruz of Texas, two up-and-coming U.S. senators in the race.

But the most relieved candidate after the two-hour encounter inside the Milwaukee Theatre was Bush, the former Florida governor who was outclassed in the three previous debates and has suffered an erosion of support from Republican voters and a drop-off in financial donations.

See notable moments from Tuesday night's debate in photos:

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GOP Debate Nov. 10
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Republican Jeb Bush survives debate with steady performance
Donald Trump talks to supporters after the Republican presidential debate at the Milwaukee Theatre, Tuesday, Nov. 10, 2015, in Milwaukee. (AP Photo/Morry Gash)
Jeb Bush and Donald Trump shake hands after the Republican presidential debate at the Milwaukee Theatre, Tuesday, Nov. 10, 2015, in Milwaukee. (AP Photo/Morry Gash)
MILWAUKEE, WI - NOVEMBER 10: Republican presidential candidate Jeb Bush speaks during the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls. (Photo by Scott Olson/Getty Images)
MILWAUKEE, WI - NOVEMBER 10: Republican presidential candidates Donald Trump (R) and Sen. Marco Rubio (R-FL) talk during a commercial break at the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls. (Photo by Scott Olson/Getty Images)
MILWAUKEE, WI - NOVEMBER 10: Presidential candidate Sen. Ted Cruz (R-TX) waves at the start of the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls. (Photo by Scott Olson/Getty Images)
MILWAUKEE, WI - NOVEMBER 10: Presidential candidate Donald Trump gestures during the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls. (Photo by Scott Olson/Getty Images)
MILWAUKEE, WI - NOVEMBER 10: Republican presidential candidates Jeb Bush (L) and Donald Trump (R) look on as U.S. Sen. Marco Rubio (R-FL) speaks during the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre on November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls. (Photo by Scott Olson/Getty Images)
John Kasich speaks during Republican presidential debate at Milwaukee Theatre, Tuesday, Nov. 10, 2015, in Milwaukee. (AP Photo/Morry Gash)
MILWAUKEE, WI - NOVEMBER 10: Presidential candidate Donald Trump (R) speaks while Sen. Marco Rubio (R-FL) looks on while Donald Trump looks on during the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls. (Photo by Scott Olson/Getty Images)
Rand Paul speaks during Republican presidential debate at Milwaukee Theatre, Tuesday, Nov. 10, 2015, in Milwaukee. (AP Photo/Morry Gash)
MILWAUKEE, WI - NOVEMBER 10: Republican presidential candidate Carly Fiorina speaks during the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls. (Photo by Scott Olson/Getty Images)
MILWAUKEE, WI - NOVEMBER 10: Republican presidential candidate Jeb Bush speaks during the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls. (Photo by Scott Olson/Getty Images)
Ben Carson laughs during Republican presidential debate at Milwaukee Theatre, Tuesday, Nov. 10, 2015, in Milwaukee. (AP Photo/Morry Gash)
Donald Trump, left, speaks as Ben Carson watches during Republican presidential debate at Milwaukee Theatre, Tuesday, Nov. 10, 2015, in Milwaukee. (AP Photo/Morry Gash)
Donald Trump speaks during Republican presidential debate at Milwaukee Theatre, Tuesday, Nov. 10, 2015, in Milwaukee. (AP Photo/Morry Gash)
Marco Rubio speaks during Republican presidential debate at Milwaukee Theatre, Tuesday, Nov. 10, 2015, in Milwaukee. (AP Photo/Morry Gash)
Ted Cruz, left, speaks as Carly Fiorina listens during Republican presidential debate at Milwaukee Theatre, Tuesday, Nov. 10, 2015, in Milwaukee. (AP Photo/Morry Gash)
Rick Santorum gestures as Chris Christie watches during Republican presidential debate at Milwaukee Theatre, Tuesday, Nov. 10, 2015, in Milwaukee. (AP Photo/Jeffrey Phelps)
John Kasich speaks during Republican presidential debate at Milwaukee Theatre, Tuesday, Nov. 10, 2015, in Milwaukee. (AP Photo/Morry Gash)
MILWAUKEE, WI - NOVEMBER 10: Presidential candidate Sen. Marco Rubio (R-FL) speaks during Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls. (Photo by Scott Olson/Getty Images)
Ben Carson speaks during Republican presidential debate at Milwaukee Theatre, Tuesday, Nov. 10, 2015, in Milwaukee. (AP Photo/Morry Gash)
MILWAUKEE, WI - NOVEMBER 10: Presidential candidates Ohio Governor John Kasich (L-R) and Jeb Bush take the stage at the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls. (Photo by Scott Olson/Getty Images)
MILWAUKEE, WI - NOVEMBER 10: Presidential candidates Ohio Governor John Kasich (L-R), Jeb Bush, Sen. Marco Rubio (R-FL), Donald Trump, Ben Carson, Ted Cruz (R-TX), Carly Fiorina, and Sen. Rand Paul (R-KY) take the stage in the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls. (Photo by Scott Olson/Getty Images)
Republican presidential candidates John Kasich, Jeb Bush, Marco Rubio, Donald Trump, Ben Carson, Ted Cruz, Carly Fiorina and Rand Paul take the stage during Republican presidential debate at Milwaukee Theatre, Tuesday, Nov. 10, 2015, in Milwaukee. (AP Photo/Morry Gash)
MILWAUKEE, WI - NOVEMBER 10: Presidential candidate Sen. Ted Cruz (R-TX) speaks while Ben Carson looks on the during the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls. (Photo by Scott Olson/Getty Images)
MILWAUKEE, WI - NOVEMBER 10: Presidential candidates Ohio Governor John Kasich (L-R), Jeb Bush, and Sen. Marco Rubio (R-FL) take the stage at the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls. (Photo by Scott Olson/Getty Images)
MILWAUKEE, WI - NOVEMBER 10: Presidential candidates Ohio Governor John Kasich (L-R) speaks while Jeb Bush and Sen. Marco Rubio (R-FL) look on during the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls. (Photo by Scott Olson/Getty Images)
Republican presidential candidates Jeb Bush (R) and John Kasich (L) participate in the Republican Presidential Debate hosted by Fox Business and The Wall Street Journal November 10, 2015 in Milwaukee, Wisconsin. AFP PHOTO / JOSHUA LOTT (Photo credit should read Joshua LOTT/AFP/Getty Images)
Police gather in front of Donald Trump's bus outside of the Milwaukee Theatre before a Republican presidential debate Tuesday, Nov. 10, 2015, in Milwaukee. (AP Photo/Jeffrey Phelps)
Republican presidential candidates (L-R) John Kasich, Jeb Bush, Marco Rubio, Donald Trump, Ben Carson, Ted Cruz, Carly Fiorina and Rand Paul stand on stage during the Republican Presidential Debate hosted by Fox Business and The Wall Street Journal November 10, 2015 in Milwaukee, Wisconsin.AFP PHOTO / JOSHUA LOTT (Photo credit should read Joshua LOTT/AFP/Getty Images)
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Trump, a billionaire businessman who has led opinion polls in the Republican race for months, gave Bush an opening when he said it was okay with him if Russian President Vladimir Putin "wants to go and knock the hell out of ISIS" in Syria and Iraq, a reference to Islamic State militants in the two Middle East countries.

Bush, who mostly steered clear of attacking his rivals after previous attempts had fallen flat, quickly interjected.

"We're not going to be the world's policemen, but we sure as heck better be the world's leader," Bush said, saying Trump's views of Putin and his policies in Syria were "like a board game. That's like playing Monopoly or something. That's not how the real world works."

That Bush was able to stop the bleeding may give him time to regain his footing in the unpredictable Republican race with the next debate more than a month away, on Dec. 15 in Las Vegas. Bush is campaigning on Wednesday in Iowa, which on Feb. 1 holds the first nominating contest of the November 2016 election.

SEE ALSO: The GOP debate, in 1 GIF

"Jeb Bush was much improved. At a minimum, this buys him more time to reset and try to advance," said Fergus Cullen, a former chairman of the New Hampshire Republican Party.

Bush officials, including finance chief Woody Johnson, owner of the New York Jets, offered an upbeat message in a conference call to donors immediately after the debate.

"This is a performance you can sell and help keep the fundraising going," Heather Larrison, a top aide to Bush's campaign, told the donors, according to one participant on the call.

It is a critical time in the race for the Republican nomination, with retired neurosurgeon Ben Carson and Trump fighting to hold their spots atop polls and Rubio trying to build on the momentum of his last strong debate performance.

Rubio, 44, who is competing with Bush, 62, for establishment Republican votes, found himself under fire from fellow Senator Rand Paul for promoting what Paul called a $1 trillion increase in military spending.

"Marco, how is it conservative to add $1 trillion in expenditures to the federal government?" Paul said.

CRUZ, RUBIO BOOSTED

Rubio dismissed the criticism with a vow to do what it takes to protect U.S. national security, a pledge other candidates embraced, and the crowd roared its approval.

"We have to make our military bigger, better and stronger than ever before," agreed Trump.

Social media rewarded both Cruz and Rubio.

Cruz had the highest social media sentiment score of 59 with nearly 9,500 tweets mentioning his name during the fourth Republican debate, according to Topsy, an analytics platform that tracks and analyzes mentions and trends on social media websites Twitter and Google+.

Rubio followed with 4,695 social media mentions and a score of 57. A score higher than 50 indicates there are more positive mentions of the candidate than negative ones.

Trump came under fire for his immigration plan, which envisions building a wall on the border with Mexico and round up and deport undocumented immigrants.

Ohio Governor John Kasich and Bush both criticized Trump's plan, which many Republicans fear will alienate Hispanic voters who are vital to winning the election.

"That's the problem with this. We need to win the presidency, and the way you win the presidency is to have practical plans," Bush said, adding Democratic front-runner Hillary Clinton's staff was "high-fiving" over the proposal.

A Clinton campaign spokesman, Brian Fallon, tweeted during the debate that "we actually are doing high-fives right now."

Carson, after a rough week of scrutiny about whether he embellished key aspects of his biography, lashed out at his critics and said he did not like being "lied about."

"I have no problem with being vetted," Carson said. "What I do have a problem with is being lied about and having that put out there as true."

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