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Mrs. Obama gave a preview of the Democrats’ re-election theme this week at a fundraiser in Nevada.

“Whether it’s health care or our economy, whether it’s education or foreign policy, the choice we make this November will determine nothing less than who we are as a country,” she said. “We cannot turn back now. We need to keep moving forward.”

Targeting Ohio and Virginia

The campaign’s choice of Ohio and Virginia for its official rollout is also an indication of those states’ must-win status. Mr. Obama captured both states in 2008, and Republican George W. Bush won them in the previous two elections. Virginia GOP Chairman Pat Mullins said it will be different for the president this year.

“Republicans won big in Virginia in 2009, 2010 and 2011,” Mr. Mullins said. “We’ve seen important victories every year since President Obama has been in office, because Virginians are rejecting his agenda. He’s been exposed for what he truly is: a cold, calculating, Chicago political operator.”

Mitt Romney, the presumptive Republican nominee, campaigned in Virginia ahead of Mr. Obama on Thursday. He criticized the president’s energy policies for harming the state’s coal industry and thwarting jobs by preventing offshore oil drilling.

But Obama campaign officials signaled Thursday that they intend to focus the discussion in Virginia on women’s issues. In a memo, campaign spokeswoman Stephanie Cutter said Mr. Romney and Virginia Gov. Bob McDonnell “share an extreme agenda on women’s health and economic security.”

“Mitt Romney supports handing over women’s health care decisions to their bosses, promises to defund Planned Parenthood and refuses to say whether he would have signed the Lilly Ledbetter Fair Pay Act that helps women fight back when they’re paid unfairly,” the memo says. “Women can’t afford to turn back the clock by electing Mitt Romney.”

To illustrate the point, the Obama campaign’s website is introducing an online tool called “the Life of Julia,” which shows voters how each candidate’s policies would affect a typical middle-class woman from cradle to grave. Suffice to say, “Julia” emerges much more healthy and better educated under Mr. Obama’s policies.

Romney up in recent polls

In Ohio, a Quinnipiac University poll released Thursday shows that Mr. Romney has pulled into a virtual tie with Mr. Obama after trailing by 6 percentage points in late March. The survey now has Mr. Obama at 44 percent and Mr. Romney at 42 percent, well within the poll’s margin of error of 2.9 percentage points.

Pollster Peter Brown attributed Mr. Romney’s improved showing in Ohio to his win in the Republican nominating race and to continued concern about the economy.

“Voter optimism about the economy has leveled off,” Mr. Brown said.

The same poll showed Mr. Romney in a virtual tie with the president in Florida, another critical battleground state (the Republican leads 44 percent to 43 percent), after trailing Mr. Obama there by 7 points in late March. In Pennsylvania, another state Mr. Obama won four years ago, the president has expanded his lead over Mr. Romney from 3 percentage points to 8, 47 percent to 39 percent.