Question:
Which employer did Tommy Vietor work for in Mar, 2012?

Context:
 Tommy Vietor works for Executive Office of the President of the United States from Jan, 2009 to Jan, 2011. 
 Tommy Vietor works for United States National Security Council from Jan, 2011 to Mar, 2013. 
 Tommy Vietor works for Barack Obama presidential campaign, 2008 from Jan, 2007 to Nov, 2008.

Answer:
Question:
Which employer did Tommy Vietor work for in Mar, 2012?

Context:
 Tommy Vietor works for Executive Office of the President of the United States from Jan, 2009 to Jan, 2011. 
 Tommy Vietor works for United States National Security Council from Jan, 2011 to Mar, 2013. 
 Tommy Vietor works for Barack Obama presidential campaign, 2008 from Jan, 2007 to Nov, 2008.

Answer:
user
United States National Security Council
assistant
Question:
Which employer did Tommy Vietor work for in Mar, 2012?

Context:
 Tommy Vietor works for Executive Office of the President of the United States from Jan, 2009 to Jan, 2011. 
 Tommy Vietor works for United States National Security Council from Jan, 2011 to Mar, 2013. 
 Tommy Vietor works for Barack Obama presidential campaign, 2008 from Jan, 2007 to Nov, 2008.

Answer:
user
Barack Obama presidential campaign, 2008
Executive Office of the President of the United States
assistant
Question:
Which employer did Tommy Vietor work for in Mar, 2012?

Context:
 Tommy Vietor works for Executive Office of the President of the United States from Jan, 2009 to Jan, 2011. 
 Tommy Vietor works for United States National Security Council from Jan, 2011 to Mar, 2013. 
 Tommy Vietor works for Barack Obama presidential campaign, 2008 from Jan, 2007 to Nov, 2008.

Answer:
user
United States National Security Council
assistant