Documents with Social Security numbers have been available since 2005 on a Web site that contains land records filed in Iowa counties, although access has now been restricted.

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CEDARBURG, Wisconsin (Reuters) - Presidential rivals John McCain and Barack Obama, back on the campaign trail after their party conventions, clashed over the ailing U.S. economy on Friday as unemployment hit its highest monthly rate in nearly five years.

Documents with Social Security numbers have been available since 2005 on a Web site that contains land records filed in Iowa counties, although access has now been restricted.