Poll: Favourite Oscar-Nominated James Stewart Role?

Mr. Stewart is widely considered one of the greatest actors ever, despite only winning one Oscar - Best Actor in a Leading Role for Philadelphia Story. He was nominated for four other performances, and I put it to y'all - which is your favourite performance? Keep in mind I'm not asking for favourite film, but performance. Let's go! http://www.imdb.com/board/bd0000088/nest/244774950