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 MYRTLE BEACH, S.C. — Senator Marco Rubio, opening a more aggressive phase of his campaign as he tries to reinvigorate his bid for the Republican nomination, suggested Thursday that Donald J. Trump may be too crude to be president and that Jeb Bush, the former Florida governor, may be too inexperienced. 
  
  
  
  
  
  
  
  
  
 Mr. Rubio expressed disgust with Mr. Trump’s use of obscene language earlier this week, describing how his two young sons had watched a news clip of Mr. Trump insulting Senator Ted Cruz on the eve of Tuesday’s New Hampshire primary. When the boys, age 8 and 10, asked their father what word had been bleeped out, Mr. Rubio said, he was at a loss. 
  
 “The commentator said it was another word for cat,” Mr. Rubio said in an interview on Thursday aboard his campaign plane, which touched down here for a rally. “My boys wanted to know, ‘What was the word? What was the word?’ I said, ‘I can’t tell you.’ I had to make something up. And it bothered me.” 
  
 “I think you can be a straight talker,” he added, “but yet do it in a way that doesn’t offend.” 
  
 His scolding of Mr. Trump, and his assertion that Mr. Bush — who is trumpeting the endorsements of dozens of retired generals and admirals — lacks foreign policy experience, reflected the high stakes here for Mr. Rubio, who is steeling for an intense battle heading into the Feb. 20 primary with rivals who have just as much on the line. 
  
 The contest here could settle what the New Hampshire primary did not: Which Republican will survive as the choice of the party’s voters who are turned off by Mr. Trump and Mr. Cruz, the hard-liners who have won the first two nominating contests? 
  
 Accusations and insults flew on Thursday, in new commercials and from the candidates themselves. 
  
 Gov. John Kasich of Ohio, whose second-place finish in New Hampshire has buoyed his campaign — he picked up the support of Kenneth Langone, a founder of Home Depot, on Thursday after Gov. Chris Christie’s exit — also grew more confrontational. He accused Mr. Bush of going at his opponents so aggressively that he was risking tarnishing his family name. 
  
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 “I’m worried about Jeb,” Mr. Kasich said at a town hall-style meeting at a pancake restaurant on South Carolina’s coast. “It’s all negative. How the heck can you sell negative?” 
  
 “I don’t know what he’s thinking,” Mr. Kasich told reporters later. “Does he realize the family legacy?” 
  
 Mr. Bush shot back that Mr. Kasich’s expansion of Medicaid in Ohio was a costly “expansion of government,” adding: “Here in South Carolina, people are looking for a conservative candidate.” 
  
 Mr. Bush was planning to send reinforcements to the state, starting on Monday with a North Charleston rally featuring his brother, George W. Bush, whose victory here in 2000 was pivotal in his presidential campaign. 
  
 Though Mr. Trump’s campaign pulled a negative ad attacking Mr. Cruz on Thursday, saying it wanted to stay positive, Mr. Cruz’s aides released two harshly negative ads attacking Mr. Trump for his use of eminent domain to try to demolish an elderly woman’s home in Atlantic City — one suggesting his behavior was childish, the other accusing him of a “pattern of sleaze.” 
  
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 Mr. Cruz also introduced a television advertisement mocking Mr. Rubio as little more than a “pretty face” and hitting him for his prior support of a path to citizenship for people in the country illegally. The Cruz campaign later took the ad down after BuzzFeed reported that one of the actresses in it had started in adult films. 
  
 Some of the most intense Republican skirmishing here is expected between the Bush and Rubio campaigns, as it appears increasingly unlikely that both will be able to advance beyond South Carolina. So each has embraced the same imperative: Take the other out. 
  
 During his swing across the state on Thursday — which started at a resort near Hilton Head and ended at a Christian school outside Greenville — Mr. Rubio was as biting about Mr. Bush as he has ever been. 
  
 “I don’t think the conservative movement would be excited about Jeb Bush,” he said in the interview with reporters on his plane. “On the major issues facing the conservative movement over the last seven years, he’s been basically missing in action. He hasn’t really been a part of that fight.” He cited Republican-led battles against the Affordable Care Act and Common Core as examples. 
  
 Responding to assertions from Mr. Bush and others that he has not made tough or consequential decisions, Mr. Rubio called Mr. Bush’s experience in world affairs inferior to his own as a member of the Senate Foreign Relations and Intelligence Committees. 
  
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 “Jeb has no foreign policy experience,” he said. “None.” 
  
 “And if he wants to make this election about experience, well, the most important job of the president is to be commander in chief.” 
  
 Mr. Bush, in Columbia, S.C., pointed to his leadership of the Florida National Guard and long list of advisers. “I’m pretty fluent on the issues of foreign policy,” he said. “And Marco can say that he has a record, but what would it be? That he goes to committee hearings and talks to people?” 
  
 As he fights for a strong finish, Mr. Rubio, who was criticized for running a cautious, buttoned-up campaign, is increasingly trying to show spontaneity and sincerity. 
  
 With breakfast at Cracker Barrel, a 45-minute news conference — the longest he said he had given in almost a decade — and attempts to reveal more about himself and his family life, Mr. Rubio said he was opening up as a way to “fill in the blanks” about him. 
  
 Doing so, he hopes, will help shatter the caricature of him as mechanical and stilted that developed after last week’s Republican debate, when he repeated himself four times. 
  
 At the Christian school outside Greenville, Mr. Rubio wistfully described the importance of having his family travel with him. 
  
 “Every morning when I wake up,” he said, with his family at his side, “I get to see my kids, even if for a brief moment.” 
  
 He also toed the conservative line on social issues that are important to many voters here. When asked about same-sex marriage, he said that he hoped and believed that the Supreme Court would eventually overturn its decision that the Constitution guarantees a right to such marriages. 
  
 And when asked about the removal of the Confederate flag from the State House grounds in Columbia, he said in the interview that while he thought the South Carolina lawmakers had eventually made the right call, it was their decision alone to make. 
  
 And as president, he said, he would not have weighed in. “I’m not sure a president is a positive contributor to that debate,” he said. ||||| These crawls are part of an effort to archive pages as they are created and archive the pages that they refer to. That way, as the pages that are referenced are changed or taken from the web, a link to the version that was live when the page was written will be preserved.Then the Internet Archive hopes that references to these archived pages will be put in place of a link that would be otherwise be broken, or a companion link to allow people to see what was originally intended by a page's authors.The goal is to fix all broken links on the web . Crawls of supported "No More 404" sites. ||||| Story highlights Sen. Marco Rubio has a new enemy on the campaign trail: Chocolate 
  
 Specifically when it's frozen 
  
 Washington (CNN) Sen. Marco Rubio has a new enemy on the campaign trail: Chocolate. Specifically when it's frozen. 
  
 The Florida Republican told reporters on Thursday that he cracked a tooth the night before on a Twix bar that had frozen, either from cold weather generally or being on his airplane for too long. 
  
 The presidential candidate gathered with reporters at a Cracker Barrel in South Carolina where he had breakfast Thursday morning, but he said before the meal he had been at the dentist. 
  
 "I bit into a Twix bar that I think was potentially frozen, just from the cold weather, or whatever, and I cracked a molar," Rubio said in an availability with reporters later in the afternoon. 
  
 But he assured the press -- and his rivals -- that he wouldn't allow the incident to slow him down. 
  
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Output:
Marco Rubio is not having a good week. On Wednesday, the day after slumping to fifth place in the New Hampshire primary, he cracked a molar while eating a Twix bar. "I go, 'Man this Twix bar's got something really hard in it,'" Rubio said during a campaign stop at a Cracker Barrel in South Carolina Thursday, per the Wall Street Journal. "And I go, 'Oh my gosh, I cracked my tooth.'" The 44-year-old, who couldn't eat anything tougher than blueberry pancakes after the incident, said, "I think I'm getting old, man." CNN reports that Rubio said the candy bar was partially frozen, possibly from being on his campaign plane for too long. Rubio promised that the dental trouble wouldn't slow him down, and his attacks on his rivals Thursday were far from toothless, the New York Times reports. He slammed Jeb Bush for lacking foreign policy experience and for being "missing in action" for the last seven years, and he laid into Donald Trump for using offensive language to describe Ted Cruz. He said his sons, ages 8 and 10, asked him what had been bleeped out in a TV broadcast. "The commentator said it was another word for cat," Rubio said. "My boys wanted to know, 'What was the word? What was the word?' I said, 'I can't tell you.' I had to make something up. And it bothered me."