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Former Virginia Govs. Tim Kaine (left) and George Allen after a Senate debate in Richmond, Va., on Dec.. 7, 2011. Steve Helber/AP hide caption

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Steve Helber/AP

An image from the Republican National Committee's Facebook page advertises its new "Social Victory Center" app. RNC via Facebook.com hide caption

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RNC via Facebook.com

That New Friend You Made On Facebook? He Might Be Named Mitt Or Barack

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Fairchild's first microchip combined four transistors, six resistors and their interconnecting wires onto a single sliver of silicon, in 1960. Today's microprocessors can employ more than 1 billion transistors. Fairchild/Courtesy of the Computer History Museum hide caption

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Fairchild/Courtesy of the Computer History Museum

Conservative talk show host Rush Limbaugh talks with guests at the White House in 2009. Limbaugh apologized March 3 to Georgetown University law student Sandra Fluke after he branded her a "slut" and "prostitute." Ron Edmonds/AP hide caption

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Ron Edmonds/AP