From older articles:
http://www.newswithviews.com/Bill/sizemore1.htm
“There was a case in Oregon recently where a woman traced a dozen or so signatures on a petition. Each signature was examined by a clerk at the elections division and compared to the original signature on the person’s voter’s voter registration card. Every signature was certified as genuine. They weren’t. They were all fraudulent. The woman had traced them from another document, and they only looked genuine. The elections division missed every one of them.
And this:
http://wyden.senate.gov/media/speeches/2002/02262002_electionreform_statement.html
Since the 1996 May primary, 13 cases of fraud have been prosecuted; convictions were won in five and eight are still pending. So, Oregon has prosecuted and continues to prosecute cases of alleged voter fraud, and the signature authentication system has proven remarkably good at detecting and deterring fraud. Despite the record, this bill says Oregon’s system is not good enough.