(Portland, OR)  --  The federal government is about to launch an audit of the troubled Cover Oregon website.  A spokesperson for Congressman Greg Walden tells KATU-TV that the Government Accountability Office will undertake a review of the website.  Walden calls the website "the biggest investment failure the state's ever seen" and he's hoping the review finds the true circumstances surrounding the problems plaguing the website.  Cover Oregon spokesman Michael Cox says they'll "participate fully with the GAO as they conduct their work."