President Obama's re-election campaign is really starting to hit Mitt Romney on the wealth issue.

Its website now displays a world map that tags the countries where Romney has holdings.

The headline reads "Tell Mitt Romney: Bring your offshore accounts back to the USA."

Romney has accounts or family trusts in Ireland, Bermuda, Germany, Luxembourg, Australia, the Cayman Islands and Switzerland, according to the map.

"We don't know if he's using these accounts to avoid paying his fair share in taxes, but we do know that in 2010, Romney's tax rate was a startlingly low 13.9%," says the Obama website. "This means Romney pays a lower tax rate than many teachers, firefighters, police officers, and other middle-class Americans -- even a lower rate than most other millionaires."

Romney aides describe the map as an attempt to divert attention from the slow economy and rising federal debt on Obama's watch.

"Americans know they are working harder for less every day. But President Obama has lost touch with the people he was elected to serve and now is lashing out with desperate attacks," said Romney spokesperson Amanda Henneberg.

"The American people have suffered enough over the last three years and deserve better," she said.