UPDATE:
From what I read on Krispy Kreme's Facebook wall, some locations are trying to give a glazed doughnut (no choice). Show them on your phone where it says "choice". It's right under the picture on their website here: http://krispykreme.com/ElectionDay
Also, some people who voted early have had luck getting a free doughnut without an "I voted" sticker.
Receive one free doughnut of choice on Election Day, Tuesday Nov. 8 at participating U.S. shops.
Non-participating stores are listed below.