I've got an old pair of shoes, well broke in and comfortable, and I'm sending them to the White House, coz Obama needs them.
Listen to him, from 15:38 to 16:05.
"And understand this: If American workers are being denied their right to organize and collectively bargain when I’m in the White House, I will put on a comfortable pair of shoes myself, I’ll will walk on that picket line with you as President of the United States of America. Because workers deserve to know that somebody is standing in their corner."
See there? The only excuse I can think of is those shoes; he can't find a pair, so let's all send him some.
Hat tip to Michael Monk, over at the Lake, for the idea.