The silver carp captured Thursday in Illinois just downstream of the T.J. O'Brien Lock and Dam. It weighs about 8 pounds and measures 28 inches long. Courtesy of the Illinois Department of Natural Resources hide caption

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Courtesy of the Illinois Department of Natural Resources

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Republican presidential candidate Mitt Romney (right) and running mate Rep. Paul Ryan of Wisconsin greet supporters during a homecoming campaign rally Sunday in Waukesha, Wis. Justin Sullivan/Getty Images hide caption

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Justin Sullivan/Getty Images