Definition: 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. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (CNN) -- Make no mistake. A handshake is just a handshake. Fifty-year-old geopolitical conflicts don't turn on a dime. American foreign policy isn't an Etch A Sketch where you get to wipe the board clean in every news cycle. Between countries, as with people, grudges and hard feelings don't fade easily. These things are true no matter how eager some in the media are to give President Barack Obama's sagging job approval rating -- just 41% in a recent Gallup Poll -- a boost by likening him to Nelson Mandela. Seriously? There is far-fetched, and there is farcical. Comparing Obama to Mandela falls into the latter category.Ruben Navarrette: Make no mistake, a handshake is just a handshakeNavarrette: President Obama's handshake with Raul Castro is no big dealHe says it does not mean that U.S.-Cuba relations will change for the betterNavarrette: Let's keep in mind the atrocious human rights record of Cuba 
 Question:Next, I'm not even sure that _ knows how to bring people together.

Barack Obama