President Obama on Wednesday congratulated Mitt Romney on securing the Republican presidential nomination, a gesture coupled with a new line of attack on the GOP challenger that portrays his economic record while Massachusetts governor as a failure.
The president called Romney and told him "he looked forward to an important and healthy debate about America's future," Obama campaign spokesman Ben LaBolt said.
Romney's campaign said the call was "brief and cordial." Obama and Romney wished each other's families well during the upcoming race.
Romney's primary victory Tuesday in Texas pushed him past the 1,144-delegate threshold he needed to claim the nomination.
Obama congratulated his opponent even as his team looked to focus on Massachusetts under Romney. In a five-page memorandum from senior Obama campaign adviser David Axelrod, the Obama camp cast Romney as a poor steward of the Massachusetts economy during his 2003-07 tenure.
"When it comes to Mitt Romney and his economic philosophy the facts are clear -- it didn't work then, and it won't work now," Axelrod wrote.
Romney's campaign, meanwhile, was calling attention to failed stimulus projects under Obama and federal money given to "green" energy companies like Solyndra, a solar firm that received hundreds of millions of dollars from the government only to go bankrupt.
The competing lines of attack came as Romney pivoted from a long primary slog to the GOP nomination and a new summertime window to sway voters who have not yet fully tuned into the presidential campaign. Romney hopes to present himself as a worthy replacement for Obama who can help revitalize a slow-moving economy, the most important issue for voters.
The country is "just beginning a general election," Romney said in an interview on Fox News that aired Wednesday but was taped over the weekend. "We've gone through a primary not a lot of people focus time on the characteristics of a new candidate like myself, and people will get to know me better. My guess is they're going to get to know more about me than they'd like to by the time we're finished."
For months, Obama and his allies have signaled plans to target Romney's Massachusetts record, with advisers noting that the state's economy lagged in job creation and saw an increase in debt while he was governor. The critique builds upon a line of attack this month on Romney's record at private equity firm Bain Capital, which Obama's team contends led to job losses and bankrupt companies even while Bain profited.
"Whether companies succeeded or failed, Romney economics netted huge profits for him and his investors, but sometimes proved devastating for the middle-class workers whose jobs, benefits and pensions were put at risk," Axelrod wrote in the memo released Wednesday.
Axelrod sought to link Romney's Bain record with his Massachusetts experience by noting that Romney ran for governor on the basis of his private-sector background. "Under Gov. Romney, the Massachusetts economy was not at the top or even in the middle, but close to the bottom of all the states," he wrote.
Republicans contend that Obama's critique of the Bain record will backfire because it will give voters the impression that he is anti-business.
The GOP focus on Obama's green energy record, including Energy Department funding for companies like Solyndra, gives Romney a chance to rebut Bain because Republicans say Obama essentially played the role of venture capitalist by investing government money in green energy companies.
Meanwhile, Romney started a weeklong push Tuesday to raise millions of dollars during a West Coast trip.
According to the Associated Press count, his Texas victory gave him 105 delegates, pushing his total to 1,191.