Description:U.S. President Barrack Obama was sworn in for his second term in Washington D.C. on Monday amid excitement and concerns. Hundreds of thousands of people from all walks of life turned out to cheer underneath the Washington Monument. For many, the day is particularly meaningful as the inauguration falls on the same day as the national holiday commemorating the country's late civil rights leader Martin Luther King, Jr. "It's a very meaningful day. It's a passing of the torch from Doctor King to O(1:22)