Elizabeth Colbert Bush, the sister of comedian Stephen Colbert, shares a laugh with reporters after voting in Mount Pleasant, S.C., on Tuesday, March 19, 2013. Colbert Bush is one of two Democrats running Tuesday in the Democratic primary in a special election to fill South Carolina's vacant 1st Congressional District seat. (AP Photo/Bruce Smith).

Associated Press
Elizabeth Colbert Bush, the sister of comedian Stephen Colbert, shares a laugh with reporters after voting in  Mount Pleasant, S.C., on Tuesday, March 19, 2013. Colbert Bush is one of two Democrats running Tuesday in the Democratic primary in a special election to fill South Carolina's vacant 1st Congressional District seat.    (AP Photo/Bruce Smith).
Elizabeth Colbert Bush, the sister of comedian Stephen Colbert, shares a laugh with reporters after voting in Mount Pleasant, S.C., on Tuesday, March 19, 2013. Colbert Bush is one of two Democrats running Tuesday in the Democratic primary in a special election to fill South Carolina's vacant 1st Congressional District seat. (AP Photo/Bruce Smith).
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