Was watching the Biden - Stephanopoulos interview and my aunt. She mentioned that he's holding a pen. She said that people who have some sort of handicap often do that so that the look less stiff I guess. She mentioned that Bob Dole would do this. She did an impression of Biden walking and had all her fingers together and was walking like a robot and it did look like how Biden walks. So maybe they did purposely have Biden hold a pen so he looks less stiff.