The history of pleading the fifth

 Lois Lerner is sworn in before testifying to the House Oversight and Government Reform Committee May 22, in Washington, DC.
 Lois Lerner is sworn in before testifying to the House Oversight and Government Reform Committee May 22, in Washington, DC.

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    The history of pleading the fifth

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The IRS official in charge of the unit that targeted conservative groups takes the 5th. Erin Burnett reports.