President Barack Obama's second term officially began on Sunday, January 20, when he had a small swearing-in at the White House. He then took a ceremonial oath of office and delivered his inaugural address on Monday, January 21, in Washington, D.C. 

Monday was also Martin Luther King Day, a national holiday honoring the famous minister who worked hard to bring racial equality to the United States. During his inaugural address, President Obama spoke about equality for all, as well as his goals for his second term.

Martin Luther King Jr. delivered his famous "I Have A Dream" speech in Washington, D.C. in 1963. There were 250,000 people in attendance. On Monday, 3.2 times that many people crowded the National Mall and the lawn in front of the Capitol to hear President Obama's speech. About how many people listened to Obama's inaugural address in person?