Slideshow: Challenged ballots
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![A thumbprint on a challenged ballot](https://img.apmcdn.org/67c13fb15b7d71d1d2b985880a90ca4317c6ff82/uncropped/09e312-20081119-distinguishingmark.jpg)
The Franken campaign challenged this Anoka County ballot, arguing that the thumb print on it constitutes a distinguishing mark. If a voter signs a ballot or writes his Social Security Number on it, that ballot is invalid under Minnesota state law. The State Canvassing Board will need to determine whether this thumbprint has the same effect.
MPR Photo/Curtis Gilbert
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