-
Now Playing: Vice Presidential Debate 2012: Best Moments
-
Now Playing: Vice Presidential Debate 2012 Moderator's Up-Close View
-
Now Playing: Laughing Joe Biden: Smiles at the Debate
-
Now Playing: The Vice Presidential Debate 2012
-
Now Playing: After: The VP Debate 2012
-
Now Playing: Ryan on Libya: WH First Blames YouTube Video, Then Romney-Ryan
-
Now Playing: Joe Biden on Iran: 'There Is No Weapon,' 'Facts Matter'
-
Now Playing: Biden to Romney-Ryan on Economy: 'Just Get Out of the Way'
-
Now Playing: Joe Biden, Paul Ryan Spar on Medicare, Social Security
-
Now Playing: Ryan on Obama Tax Plan: 'Watch Out Middle Class ... Bill Is Coming to You'
-
Now Playing: Biden on Afghanistan: Withdrawal 'Does Not Depend on Conditions'
-
Now Playing: Paul Ryan: 'Nobody Is Proposing to Send Troops to Syria'
-
Now Playing: Biden, Ryan Questioned on Being Catholic, View on Abortion
-
Now Playing: Paul Ryan Rattles Off Obama's 'Broken Promises'
-
Now Playing: Trump's attorney withdraws 2 defamation lawsuits
-
Now Playing: Mention of Trump, Mueller and riot gear in Pittsburgh police email causes stir
-
Now Playing: Trump says he's willing to walk away from N. Korea talks
-
Now Playing: Trump says Mueller, Rosenstein 'still here' despite reports they'll be fired
-
Now Playing: The 'face' of robocalls testifies that it is as easy as a 'click of a button'
-
Now Playing: Spat over Haley 'confusion' raises questions about Trump foreign policy