Now Playing: Nancy Pelosi gets the speaker's gavel in 2007

Now Playing: US Border Patrol agent killed in 2010 shooting

Now Playing: Obama comments on Sandy Hook shooting in 2012

Now Playing: Unabomber captured in 1996 after 17 years on the run

Now Playing: Lloyd Bentsen's mic drop moment at 1988 VP debate

Now Playing: 'War of the Worlds' radio scare turns 50 in 1988

Now Playing: The 1999 crisis in Kosovo

Now Playing: George and Barbara Bush talk personality traits

Now Playing: Trump in 2015: Oprah would be a 'great' running mate

Now Playing: Columbine High School principal speaks in wake of 1999 shooting

Now Playing: Oct. 12, 1998: Matthew Shepard dies after being attacked

Now Playing: June 20, 1979: ABC News correspondent shot dead in Nicaragua

Now Playing: Alan Alda on fame and family

Now Playing: Aretha Franklin awarded Medal of Freedom in 2005

Now Playing: Aretha Franklin sings at Obama's inauguration

Now Playing: Inside the Madonna music and fashion craze of 1985

Now Playing: Martin Luther King Jr. discusses attempts on his life in 1965

Now Playing: Martin Luther King Jr. talks 'Issue and Answers' on ABC in 1967

Now Playing: Cleveland women escape kidnapper's home: May 6, 2013

Now Playing: May 17, 2017: Robert Mueller appointed to special counsel in Russia probe