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) Sometimes a historic moment arrives like an IMAX movie: a big, loud, jarring event that bends the arc of history. Other times, though, it sneaks up on people. It seems modest at the time, but only later do Americans realize it marked a turning point -- that something new had burst onto the national stage and the old rules no longer applied. Did President Barack Obama have such a moment this week when he wept openly about children killed by gun violence? Some say yes, and that Obama's tears were more radical than people realize. Most people know the backdrop: While announcing executive orders Tuesday to strengthen gun control laws, Obama halted as the cameras clicked. He tried to regain his composure, but then the tears flowed as he talked about 20 schoolchildren murdered by a gunman at Sandy Hook Elementary School in 2012.Obama's tears during his gun control speech were revolutionary, several historians and political scientists sayHe became the "father-in-chief," shedding tears over the deaths of white children, they sayHe also showed it was OK for men -- and political leaders -- to cry in public 
 Question:"He's us, and in many ways, that's _'s greatest triumph."

Barack Obama