Wikipedia has come under fire in recent months by critics that question the reliability of its information. But the site’s investigation into Congressional changes highlight how closely amendments to information are scrutinized. The online reference compendium has found that employees working in the U.S. Congress have made several changes to political biographies, removing facts considered negative and tweaking language to portray politicians in a better light. Wikipedia began an investigation after a Democratic representative, Marty Meehan, admitted that he had spiffed up his online biography page. It was found that articles on other senators had been changed, sometimes significantly, and that the edits could be traced to computers on Capitol Hill. Researchers discovered the links to the U.S. Senate and began checking the biographies that had been visited. Half a dozen pages were changed, according to Wikipedia, including those of California Senator Dianne Feinstein, Iowa Senator Tom Harkin, and Minnesota Senator Norm Coleman.