President Barack Obama kicked off his second term with an inaugural address that called for national unity and setting a pragmatic tone for the daunting challenges he faces over the next four years. Obama's ceremonial swearing-in at the US capital was filled with traditional pomp and pageantry, but it was a scaled-back inauguration compared to the historic start of his presidency in 2009 when he swept into office on a mantle of hope and change as America's first black President.