In a photo released by NBC News, Secretary of State Hillary Clinton and Secretary of Defense Robert Gates discuss Middle East policy on Meet the Press. William B. Plowman/AP hide caption

itoggle caption William B. Plowman/AP

Karen Wallace (right) and Meryleigh Brainerd (left), both teachers in California, join in a candlelight vigil in front of the state Capitol to express solidarity with union members in Wisconsin. Decades ago, says a labor historian, the typical unionized worker was a blue-collar male. Now, it's more likely to be a schoolteacher. Robert Durell/AP hide caption

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President Ronald Reagan campaigns for his economic policies in 1987 before a sign that reads "Truth in Spending, Americans Deserve It." Mike Sargent/AFP/Getty Images hide caption

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The crowd cheers during last year's Conservative Political Action Conference in Washington. Jose Luis Magana/AP hide caption

itoggle caption Jose Luis Magana/AP