Mitt Romney, the former governor of Massachusetts, will make his second bid for the presidency official on Thursday with a broadside against President Obama and a call for a new economic agenda.

In excerpts released by his campaign, Mr. Romney accuses the president of failing to live up to the promise of economic recovery he made during his 2008 campaign.

“At the time, we didn’t know what sort of a president he would make,” Mr. Romney will say as he makes his announcement from a family farm in New Hampshire. “Now, in the third year of his four-year term, we have more than promises and slogans to go by. Barack Obama has failed America.”

The attacks on Mr. Obama promise to be a centerpiece of Mr. Romney’s campaign as he seeks to present himself as the inevitable choice for Republicans eager to reclaim the White House. In his speech on Thursday, he will pledge, without hesitance, to repeal the president’s health care reforms.

“We will return responsibility and authority to the states for dozens of government programs – and that begins with a complete repeal of Obamacare,” he will say, according to the excerpts. “From my first day in office my number one job will be to see that America once again is number in job creation.”

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