NEW YORK - Leonardo DiCaprio is bringing out the big guns to get out the vote. Tom Cruise, Julia Roberts, Harrison Ford, Will Smith, Steven Spielberg and Justin Timberlake are among the celebrities starring in a new public service announcement produced by the actor, who also appears in the spot. The video shows the stars struggling to grasp the concept of using reverse psychology to get young people into voting booths... Finally, Ford says, “You know what? I can’t do it. It’s not true, I don’t believe it — 537 people decided the 2000 election, and you want me to...