The Clackamas County Elections Office is under investigation by the Oregon Department of Justice for possible ballot tampering, reports the Oregonian. A temporary election worker allegedly filled in a straight Republican ticket where voters had left blank preferences. It is unclear how many ballots were affected, but, as Blue Oregon notes, this is not the first time Clackamas County has come under scrutiny for foul play.
The state elections office has twice had to monitor the county elections office. In 2011, an elections director had to step in when county clerk Sherry Hall accepted invalid signatures for a Tea Party-backed urban renewal petition.