Detailed Instructions: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Among the entities, try to find the best entity that is most likely to fill in "_" and classify the answers based on options.
Problem:(CNN) -- Get ready: The 2016 campaign for the White House is getting under way. Among those attending next week's Republican Governors Association meeting in Las Vegas are the group's chairman, Virginia Gov. Bob McDonnell, as well as popular Republican governors such as New Jersey's Chris Christie, Wisconsin's Scott Walker and Louisiana's Bobby Jindal. While the RGA's annual confabs are all about policy and politics, 2016 is sure to come up because all four governors are thought to be contenders for the party's next presidential nomination. Even though the 2012 election is barely in the rear view mirror, speculation over the next race for the White House is getting started. With President Barack Obama winning a second term on Tuesday, an incumbent will not run in 2016, meaning both parties may have competitive nomination battles.The GOP's next presidential nominee might be at Republican governors gatheringNew Jersey Gov. Chris Christie tops the list, but he has tough reelection fight aheadJoe Biden and Hillary Clinton are mentioned most often as Democratic candidatesGOP strategist says retread from past races won't be able to take party into the future 
 Questions:Walker is a hero to many conservatives, thanks to his battles against public sector workers in _. (A) CNN (B) White House (C) Republican Governors Association (D) Las Vegas (E) Virginia (F) Bob McDonnell (G) Republican (H) New Jersey (I) Chris Christie (J) Wisconsin (K) Scott Walker (L) Louisiana (M) Bobby Jindal (N) RGA (O) Barack Obama (P) GOP (Q) Joe Biden (R) Hillary Clinton (S) Democratic
Solution:
(J)