Many Republicans have also called on Romney to be more forthcoming about his personal wealth and income.
Meantime, Romney wrote an op-ed in The Wall Street Journal touting "what I learned at Bain Capital."
"The lessons I learned over my 15 years at Bain Capital were valuable in helping me turn around the 2002 Winter Olympics in Salt Lake City," he said in the article published Friday. "They also helped me as governor of Massachusetts to turn a budget deficit into a surplus and reduce our unemployment to 4.7 percent. The lessons from that time would help me as president to fix our economy, create jobs and get things done in Washington."
As Romney pushed toward his party's convention, Democrats unveiled more plans for their convention, which follows the GOP events.
Democratic Party officials announced a new slate of speakers, including two prominent businessmen: CarMax co-founder and former CEO Austin Ligon and Costco co-founder and former CEO Jim Sinegal.
Newark Mayor Cory Booker will also speak at the convention, a sign that tensions have eased between him and the Obama campaign after he criticized the president's attacks on Romney's private sector background.
Associated Press writer Kasie Hunt in Washington contributed to this report.
Follow Julie Pace at http://twitter.com/jpaceDC
- From 0.3 to 81.1: What percentage of each...
- Vietnam says it may have found missing jet's...
- Jet may have turned; suspicious passengers...
- Vietnam says cannot find object from missing jet
- Rutgers faculty council pushes for school to...
- Themes of faith, freedom echo at CPAC in...
- Oil slick not from missing Malaysian plane;...
- FBI to investigate disappearance of a...
- Obama administration allows 2-year... 28
- Disney ending funding to Boy Scouts in... 21
- Half of millennials more likely to lean... 19
- Early auditions for 2016 Republican... 18
- Rutgers faculty council pushes for... 13
- Former IRS official Lois Lerner again... 11
- US announces visa restrictions on Russians 9
- Former Secretary of State Hillary... 6