President Barack Obama and Vice President Joe Biden were officially sworn in for their second terms on Sunday, a day ahead of taking their public oaths before a crowd on the National Mall.

Obama concedes more work needs to be done in his second act, and the just-resolved fight over the fiscal cliff is one of several battles the president is expected to have with Republicans over spending.

While White House officials aren't saying much about Obama's inaugural address, analysts suggest he will focus on the goals he set and met in his first term, like passing his signature health care law and winding down two wars.

He is also expected to lay out themes for the next four years on the economy, immigration reform and possibly gun control.