Unlike with his first swearing-in, Barack Obama does not face two ongoing wars and an economy on the verge of collapse. But thorny issues remain, and there's less hope than there was four years ago that Obama can bend Washington to his will.
One of the chief expectations of those who voted for President Obama is that he moves assertively to pass climate change legislation, whatever the political climate in Washington. But that won't be easy given the polarization in Washington.
Every president gets sworn in once, but it's a smaller club of presidents who manage to get there twice. Here's a look at some recent presidents who served two terms. See who changed the most (or the least) in four years.
Among the sentiments of love of country and national unity, presidential inaugurations also have a religious element. Host Rachel Martin talks with Stephen Prothero, professor of American religion at Boston University, about how the role of faith in inauguration ceremonies has changed over the years.
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