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
- LDS missionaries developing strategies to...
- 50 things you might not know about 15 of your...
- Judge orders Colo. cake-maker to serve gay...
- Pearl Harbor ceremony marks bombing...
- Nelson Mandela's faith made him a worldwide...
- Space and religion: How believers view latest...
- Utah remembers Pearl Harbor namesake ship,...
- Snow, ice, deep-freeze hit large swath of US
- Obama: Income inequality a defining... 106
- Judge orders Colo. cake-maker to serve... 86
- LDS missionaries developing strategies... 50
- Fast-food strikes return amid push for... 31
- Colorado court hears discrimination... 30
- Utahns react to death of Nelson Mandela 26
- Research: Native American genes have... 23
- Obama declares health care law is... 21