(Image Credit: Haraz N. Ghanbari/AP Photo) 
 
 President Obama denied in an exclusive interview with ABC News that he was "tense" in his airport tarmac encounter with Arizona Gov. Jan Brewer Wednesday, as she has described. 
 
 "I'm usually accused of not being intense enough, right," he told ABC News' Diane Sawyer, laughing. "Too relaxed." 
 
 Brewer said in an interview that the president was "somewhat thin-skinned and a little tense, to say the least" and that she was "shocked by the sternness of it all." The president reportedly raised objections to Brewer's description of their meeting in June, 2010, when he met her Wednesday. 
 
 In her 2011 book, "Scorpions for Breakfast," Brewer accused Obama of being "condescending" and "patronizing" and complained that she and her aides were treated coldly by White House staffers. 
 
 Read Jan Brewer's hand-written letter to President Obama here 
 
 "I think it's always good publicity for a Republican if they're in an argument with me," Obama said of their most recent meeting. "But this was really not a big deal. She wanted to give me a letter, asking for a meeting. And I said, 'We'd be happy to meet.' 
 
 "Last time we met, she wasn't fully satisfied. But, you know, I think this is a classic example of things getting blown out of proportion." 
 
 Watch 'World News' tonight at 6:30 ET for Diane Sawyer's interview with President Obama. ||||| President Barack Obama today signaled an aggressive tact for his early re-election campaign, critiquing his Republican opponents by name and insisting he's ready to "fight with every fiber of my being" for a second term. 
 
 "How much do you want it?" ABC News' Diane Sawyer asked Obama during an exclusive interview in Las Vegas. 
 
 "Badly," the president said, "because I think the country needs it." 
 
 "Whoever wins the Republican primary is going to be a standard bearer for a vision of the country that I don't think reflects who we are," Obama said. 
 
 "I'm going to fight as hard as I can with every fiber of my being to make sure that we continue on a path that I think will restore the American dream," he said. 
 
 Obama pushed back against what he called Republicans' "rhetorical flourishes," including Newt Gingrich's oft-repeated contention that Obama is the "food stamp president." 
 
 "First of all, I don't put people on food stamps," Obama said. "People become eligible for food stamps. Second of all, the initial expansion of food-stamp eligibility happened under my Republican predecessor, not under me. No. 3, when you have a disastrous economic crash that results in 8 million people losing their jobs, more people are going to need more support from government." 
 
 "The larger point is this: that there's going to be a debate over the next eight, nine, 10 months about how to move the country forward," he said. "They've got an argument. They will make it forcefully. I think it's an argument that is wrong." 
 
 Asked whether he believes there's an undercurrent of racial tension in the "food stamp president" criticism, Obama wouldn't say. But he said the rhetoric from conservatives like that used by Gingrich illustrates an attempt by Republicans to engage in the same divisiveness that they profess to decry. 
 
 "The American people are going to make a judgment about who's trying to bring the country together and who's dividing it, who reflects the core values that helped create this country … and who is tapping into some of our worst instincts," he said. 
 
 MORE: Obama tells Sawyer he second-guesses himself constantly 
 
 Obama also used his first network interview since his State of the Union Address to single out three of his Republican rivals, jabbing Mitt Romney, Newt Gingrich and Rick Santorum as adherents of a failed political philosophy. 
 
 "We've got a test of Mr. Romney or Mr. Gingrich or Mr. Santorum's theories. We tried it for 10 years. And it resulted in a huge crash that lost us the most jobs since the 1930s," Obama said of a push for less financial regulation and lower taxes. "And why we would want to adopt something that we just tried and did not work, doesn't make sense." 
 
 Obama said the alternative he's offering – higher taxes on the wealthy, particularly millionaires and billionaires, to bankroll new government spending -- is a "a recipe for a fair, sound approach to deficit reduction and rebuilding this country," which he outlined in his speech to Congress and the nation Tuesday night. 
 
 "I think whether it's Romney or Gingrich or Santorum or any of these folks, the question to ask them is we now have the lowest tax rates in 50 years. We've seen the highest increase in income for the very top echelons since the 1920s. And if, in fact, we're going to reduce our deficit while still investing in those things that we know make America grow, somebody's got to pay for it," he said. 
 
 "I think better I pay for it or Mr. Romney pay for it or Mr. Gingrich help pay for it than a senior citizen suddenly seeing several thousands of dollars in additional Medicare increases or a student who's trying to struggle their way through school," he added. 
 
 MORE: Obama on what really happened in encounter with Gov. Brewer 
 
 First Family Readies for Campaign 
 
 While the White House has said the president will not fully engage in his re-election campaign until Republicans pick a nominee, Obama said his family is fully prepared for the quickly escalating fight expected on the trail in the days ahead. 
 
 "Michelle is very enthusiastic about campaigning for the next nine months," Obama said. " And that hasn't always been the case. I mean, this puts a strain on families. But I think she feels very strongly that we're moving the country in the right direction. I'll let her speak for herself ... but what she's told me is, "We should finish the job.'" 
 
 "And the girls?" Sawyer asked of the Obamas' daughters, Sasha, 10, and Malia, 13. 
 
 "Fortunately, they don't spend too much time worrying about their daddy's job. They've their own stuff to worry about, including doing their homework, cleaning their room and, the state of their sports teams," he said. 
 
 Watchful Eye on Iran 
 
 Obama said he's keeping a watchful eye on tension between Israel and Iran over the country's alleged clandestine nuclear program, but would not say whether the United States believes the Israelis are preparing a military strike. 
 
 "I can't discuss classified military information, certainly not information that's shared between countries," Obama said. 
 
 "But you cannot pursue a nuclear weapon. We've imposed the toughest sanctions ever. They had a lot of bite. The Iranian regime is feeling them. And, ultimately, I hope that we can resolve this through diplomatic means. But we're not taking any options off the table." 
 
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– Barack Obama appears to be shifting into campaign mode. In an interview with Diane Sawyer of ABC News last night, the president wasn't afraid to call out his would-be challengers by name, saying, "We've got a test of Mr. Romney or Mr. Gingrich or Mr. Santorum's theories. We tried it for 10 years. It resulted in a huge crash." He also directly took on Newt Gingrich's assertion that he is a "food stamp president." "I don't put people on food stamps. People become eligible for food stamps," he said, pointing out that eligibility was expanded under George W. Bush, and that "when you have a disastrous economic crash … more people are going to need more support." Asked how much he wanted another term, he replied, "Badly. Because I think the country needs it." He also brushed off his "tense" tarmac showdown with Jan Brewer. "I'm usually accused of not being intense enough, right?" he said. "I think it's always good publicity for a Republican if they're in an argument with me. But this was really not a big deal. I think this is a classic example of things getting blown out of proportion."