President Obama signs another iPad

At the NATO summit in Lisbon, Portugal, an iPad-toting attendee approached President Obama and asked him to sign his 21st century autograph pad. The President replied, "I've done this once before."

Back in October, President Obama signed an iPad at a rally at the University of Washington. As Dave Caolo noted at the time, this was the first presidential autograph captured with an iPad that we know of.

Click Read More to watch a video of the autograph.

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This article was originally published on Tuaw.