This is not a scientifically-sanctioned statement but...it does seem that when the MSM covers REPUBLICAN voter fraud, they mention party affiliation than when these free-lancers and independent and unaffiliated and lone wolf types commit voter fraud. Just an observation. I could be wrong.
http://www.wtvynews4.com/news/headlines/56646922.html
http://www.newswest9.com/Global/story.asp?S=11079351
http://www.nbc40.net/view_story.php?id=10457
http://www.pressofatlanticcity.com/news/breaking/article_299af05c-98bc-11de-ba90-001cc4c03286.html