Mitt Romney's company, Bain Capital, invested in a series of firms that specialized in outsourcing American jobs to other countries, according to a new report from The Washington Post.

The outsourcing happened during the 15 years Romney headed the venture capital firm.

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The Democratic National Committee blasted Romney on the report, calling him a "pioneer" in outsourcing jobs overseas.

The economy remains the leading issue for voters, and polls show President Obama is vulnerable on the issue. Romney has made the economy the centerpiece of his campaign.

The Post's study of securities filings shows that Bain was one of the companies involved early on in supporting companies whose mission was to help U.S. companies cut costs by outsourcing jobs to countries like China and India.

On the campaign trail, Romney has promised, if elected president, to get tough on China.

"They've been able to put American businesses out of business and kill American jobs," he said in Toledo, Ohio, in February. "If I'm president of the United States, that’s going to end."

The help from Bain included investing venture capital in some of the companies to help them expand, as well as providing strategic consulting advice.

The biggest investment was $93 million in Corporate Software Inc., which helped companies like Microsoft move their customer service centers to other countries. That company spawned Stream International and Modus Media, both of which specialized in the practice.

These investments could hurt Romney politically, especially in industrial Midwestern states like Ohio, Michigan and Iowa, where globalization is unpopular and seen as destroying the local economy.

Romney's campaign did not comment for the original article.