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.
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