Outside the Mesa Arts Center, people gathered on Wednesday to watch the debate taking place inside. It was the final one on the Republican primary calendar. More Photos »
MESA, Ariz. — Mitt Romney challenged Rick Santorum’s credentials as a fiscal conservative in a fiercely combative debate on Wednesday, trying to redefine Mr. Santorum as part of the problem in Washington and regain his footing in the fight for the Republican presidential nomination. 
A one-stop destination for the latest political news — from The Times and other top sources. Plus opinion, polls, campaign data and video.With the Arizona and Michigan primaries only six days away, followed quickly by a dozen more contests, Mr. Romney arrived here at a critical moment of his candidacy armed with a detailed indictment of Mr. Santorum’s record in Congress. Mr. Romney sought to dismantle his rival’s claim to be the authentic conservative in the race. “While I was fighting to save the Olympics, you were fighting to save the ‘Bridge to Nowhere,’ ” Mr. Romney said, drawing upon a noted symbol of government excess to drive home his point against Mr. Santorum, a former Pennsylvania senator. It was Mr. Santorum’s first time in the cross hairs as a leading candidate, an uncomfortable position that has set back other Republican challengers. He did not recoil or wither under pressure, but he was placed on the defensive again and again, with Mr. Romney and Representative Ron Paul of Texas acting as a tag team in critiquing his record in Congress. They criticized his earmarks, his vote for a provision that financed Planned Parenthood and his support of the No Child Left Behind law, President George W. Bush’s signature education plan now out of favor with conservatives. By the end of the night, the scrutiny seemed to wear on Mr. Santorum, who was taunted with boos when he said he had voted for the education program even though “it was against the principles I believed in.” He explained that he had done so because of its importance to Mr. Bush, saying: “Sometimes you take one for the team, for the leader.” That line provided an opening for Mr. Paul, who declared: “He calls this a team sport. He has to go along to get along, and that’s the way the team plays, but that’s what the problem is with Washington.” The landscape of the Republican presidential campaign — reshuffled yet again since the last time the candidates debated on Jan. 26 — came into sharp view here on stage at the Mesa Arts Center. It was the final scheduled Republican debate on the calendar, but unless a presumptive nominee emerges swiftly, debates could take place throughout the spring as the party’s nominating contest becomes a drawn-out fight for delegates. If Mr. Romney came across as a persistent prosecutor, jumping in eagerly to make his points, Mr. Santorum was defensive yet did not lose his temper as others have in the hot seat. From the start, it appeared that Mr. Romney and Mr. Santorum had a shared goal: turning the night, and the race, into a two-man contest. But Newt Gingrich came alive yet again, not as an angry combatant but as what he described as a “cheerful” alternative, enthusiastically challenging the moderator, John King of CNN, and turning questions to his own purposes. The candidates sat behind a table for only the second time in the long-running series of debates, rather than standing behind lecterns, which at times made them seem like squirmy schoolchildren scrunched into classroom desks. The economy — the dominant issue to most voters — took a back seat to a host of other topics in the wide-ranging debate, which dwelled on social issues, immigration and the arcane world of Congressional voting records. Mr. Romney played up his status as the only candidate on the stage who had never served in Washington, but Mr. Santorum would not let his rival take credit for balancing the budget as governor of Massachusetts, which is required by state law. “Don’t go around bragging about something you have to do,” Mr. Santorum said. “Michael Dukakis balanced the budget for 10 years. Does that make him qualified to be president of the United States? I don’t think so.” Mr. Santorum parried the barbs from Mr. Paul as he has all year, often laughing and shaking his head. But the exchanges between him and Mr. Romney were sharper. “You don’t know what you’re talking about,” Mr. Santorum told him at one point. “Wait — wait a second. Wait a second. Wait a second. Wait a second. Wait!” Mr. Romney said, cutting in as Mr. Santorum attacked the Massachusetts health care plan that Mr. Romney signed into law. Mr. Romney managed to bring before Republican primary voters an issue that has been a sore subject between Mr. Santorum and conservatives for years: his support in the 2004 Republican primary in Pennsylvania for Senator Arlen Specter over Pat Toomey, his conservative challenger. Michael Barbaro contributed reporting.
