Best Supporting Actor

Here are the nominees for Best Performance by an Actor in a Supporting Role. Who should win and why?

Josh Brolin, Milk
Robert Downey, Jr., Tropic Thunder
Philip Seymour Hoffman, Doubt
Heath Ledger, The Dark Knight
Michael Shannon, Revolutionary Road

Best Supporting Actor 2008

Here are the nominees for Best Performance by an Actor in a Supporting Role. Who should win and why?

Casey Affleck, The Assassination of Jesse James by the Coward Robert Ford
Javier Bardem, No Country for Old Men
Hal Holbrook, Into the Wild
Philip Seymour Hoffman, Charlie Wilson's War
Tom Wilkinson, Michael Clayton

Best Supporting Actor 2007

Here are the nominees for Best Performance by an Actor in a Supporting Role. Who should win and why?

Alan Arkin, LITTLE MISS SUNSHINE
Jackie Earle Haley, LITTLE CHILDREN
Djimon Hounsou, BLOOD DIAMOND
Eddie Murphy, DREAMGIRLS
Mark Wahlberg, THE DEPARTED