Minnesota Public Radio slideshow:
Dayton won't seek re-election as Minnesota U.S. senator
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Republicans were expected to cite Dayton's closing of his office because of a terrorist threat in the upcoming election against him. (Photo by Matthew Cavanaugh/Getty Images)

Republicans were expected to cite Dayton's closing of his office because of a terrorist threat in the upcoming election against him.

(Photo by Matthew Cavanaugh/Getty Images)
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