Watch the full-length episode at http://to.pbs.org/UJxVdX
As Barack Obama is sworn in for his second term, FRONTLINE takes a probing look at the first four years of his presidency.
With inside accounts from his battles with his Republican opponents over health care and the economy to his dramatic expansion of targeted killings of enemies, FRONTLINE examines the president’s key decisions and the experiences that will inform his second term.
