A new video PSA featuring Sarah Silverman, Jonah Hill, Leonardo DiCaprio, Forrest Whittaker, Anthony Keidis, Ellen DeGeneris, Will.I.Am, Dustin Hoffman, Jamie Foxx, Jennifer Aniston, Kevin Bacon, Halle Berry, Courteney Cox, Ashton Kutcher, Eva Longoria, Tobey Maguire, Kyra Sedgwick, Giovanni Ribisi, Usher and many others telling why you...should register and vote!