If anyone reading this just happens to support Barack Obama and wants a free Obama button, you can get one from MoveOn.org at the following link:
Be forewarned: they will ask for your email address and they will use it.
UPDATE: Then, after confirming your email address, they will inform you that your button will arrive in 4 to 6 weeks. Leaving 6 to 8 weeks to actually wear the thing before the election. Moveon.org is so annoying sometimes! Will they promise not to send me any annoying emails for 4 to 6 weeks also? I expect their emails to start falling like arrows at Agincourt within 4 to 6 hours.