Why Obama needed 22 pens to sign one single document..

TIME magazine explained the reason..

"The pen used to sign historic legislation itself becomes a historical artifact. The more pens a President uses, the more thank-you gifts he can offer to those who helped create that piece of history. The White House often engraves the pens, which are then given as keepsakes to key proponents or supporters of the newly signed legislation..."

so there.

All the President's Pens from The White House on Vimeo.