Question: What American former federal prosecutor lost the Republican nomination for the seat in a runoff on July 22, 2014 to Barry Loudermilk? 

Related documents: [0]  [DOC] Robert Laurence Barr Jr. (born November 5, 1948) is an American former federal prosecutor and a former Congressman. [END] 
[1]  [DOC] Barry Dean Loudermilk (born December 22, 1963) is an American politician from the state of Georgia. He is the U.S. Congressman from Georgia 's 11th congressional district , which covers part of Atlanta's northern suburbs. Loudermilk won the Republican nomination for the seat in a runoff on July 22, 2014 over Bob Barr, and won the general election on November 4, 2014. He won reelection to a second term in the U.S. House on November 8, 2016. [END]  
Answer: Bob Barr
Bob Barr