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Republican presidential candidates participate in the Republican Presidential Candidates Debate at St. Anselm's College Institute of Politics in Manchester, New Hampshire. Image Credit: AFP

Manchester, New Hampshire: The target on Marco Rubio’s back grew larger on Saturday, as rivals candidates, starting with Chris Christie, sought to turn the Florida senator’s polish into a liability in a critical debate on the eve of New Hampshire’s leadoff presidential primary.

Meanwhile, Jeb Bush sought anew to take on Donald Trump with a rebuke of his conservative credentials, questioning Trump’s enthusiastic support for eminent domain.

The two main clashes in the debate revealed divergent strategies followed by trailing candidates in need of a breakout moment in the crowded field: Attack the front-runner or try to blunt the momentum of a fast-rising rival.

Saturday’s nationally televised prime-time debate in Manchester offered what was probably the last best chance for candidates to shake up the field before voters here go to the polls Tuesday.

Trump is trying to sustain his celebrity-driven candidacy after finishing second in the Iowa caucuses, a blow to the New York businessman who has consistently touted his first-place ranking in polls.

But all week it has been Rubio drawing fire from his rivals, a trend that continued in the debate’s earliest moments.

Christie mocked Rubio for defending his record of accomplishment in the Senate, charging that Florida’s junior senator had never been involved in a “consequential decision where [he] had to be held accountable”.

“I like Marco Rubio, and he’s a smart person and a good guy, but he simply does not have the experience to be president of the United States,” the New Jersey governor said, arguing that Republicans shouldn’t make the same mistake the nation did eight years ago when it elected Barack Obama, another young senator.

Rubio countered by noting that New Jersey faced nine credit downgrades on Christie’s watch, then returned to his own practised criticism of Obama.

Christie pounced. “That’s what Washington, D.C., does,” he retorted. “The drive-by shot at the beginning, with incorrect and incomplete information, and then the memorised 25-second speech that is exactly what his advisers gave him.”

As the exchange continued and the two rivals spoke over one another, Rubio cranked up the volume, sweat beginning to glisten on his face. He accused Christie of not wanting to leave the campaign trail to return to his state after a huge snowstorm hit last month.

“You know what the shame is, Marco?” Christie replied. “The shame is that you would actually criticise somebody for showing up to work, plowing the street, getting the trains to run back on time, when you’ve never been responsible for that your entire life.”

Rubio fought back and easily handled several questions on foreign policy later in the debate, but repeated images of him wiping sweat from his forehead underscored the image of a young candidate being rattled by the most sustained attacks he has weathered in the campaign.

Trump fared better. Early in the debate, the winner of Iowa’s Grand Old Party caucuses, Senator Ted Cruz of Texas, sidestepped an opportunity to directly challenge Trump. Asked whether the New York billionaire had the temperament to be commander in chief, Cruz said that was “an assessment that the voters are going to make.”

Trump seized the moment to tout his image of toughness, noting that Cruz had failed to answer the question.

“People back down with Trump,” he said.

Bush, though, seized an opportunity later to question Trump’s support for the seizure of private property using the government’s power of eminent domain, a controversial practice among many conservatives.

The former Florida governor accused the New York developer of getting state officials to condemn an elderly woman’s home in Atlantic City so he could build a parking lot for limousines near his casinos.

“That is downright wrong,” Bush said, arguing that eminent domain should only be used for public purposes, such as building schools, hospitals and roads.

Trump defended eminent domain, calling it essential for a modern economy, and mocked Bush for trying to be “a tough guy.”

“I didn’t take the property,” he said.

“You tried,” Bush retorted.

The audience booed Trump — also attracting his ire. Although organisers said the audience included a thousand New Hampshire voters, Trump alleged they were donors and “special interests”.

Even though he finished third in Iowa, Rubio has benefited from it, and his campaign has picked up momentum. Averages of New Hampshire polls show Rubio in second place, narrowing the gap with Trump while putting distance between himself and the rest of the field.

Cruz and Governor John Kasich of Ohio currently are tied for third place, polling averages suggest.

Bush, Christie and Kasich are especially counting on strong performances that they hope will breathe life into their lagging campaigns. For them, the debate is an opportunity to explain why their experience should matter in an election year when voters seem resolutely uninterested in politician’s resumes.

Kasich touted his heavy courtship of New Hampshire voters, including more than 100 town hall meetings. “We have to have practical solutions,” he said in response to a question about immigration in which he rejected the idea of large-scale deportations and embraced the idea of a path to legalisation — although not citizenship — for people in the country illegally.

His statement was emblematic of his pitch as a pragmatic conservative, an appeal tailored to the state’s sizable block of independent voters.