George Washington referred to "that Almighty Being" during his inaugural address in 1789. "God" didn't show up in an inaugural speech until more than three decades later. AP hide caption

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President Obama and first lady Michelle Obama attend an inaugural ball at the Walter E. Washington Convention Center on Monday night. Mandel Ngan/AFP/Getty Images hide caption

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President Obama delivers his second inaugural address Monday in Washington. Stan Honda/AFP/Getty Images hide caption

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President Obama gives his inaugural address after taking the oath of office Monday. Brendan Smialowski/AFP/Getty Images hide caption

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As a second-term president, Barack Obama necessarily generates less excitement than he did as a newcomer. Above, flags flew during his 2009 inauguration. Eric Purcell/FlickrVision via Getty Images hide caption

itoggle caption Eric Purcell/FlickrVision via Getty Images