SEATTLE - The most valuable item stored on Sylvester Cann's iPhone isn't a phone number a voicemail or an app.
"I have a copy on the iPhone. I have on my storage drive at home and on my Macbook and PC at home. I have it at five different places," he said.
On Thursday Cann waited nearly five hours outside the University of Washington's Hec Ed to get it.
The avid Obama supporter went to a rally for Democratic Senator Patty Murray. That's when inspiration hit.
"About half-way through the rally I had the idea," he said.
While many Seattleites jostled to shake the president's hand, Cann had another plan.
"We shook hands. First I said Mr. President it's an honor, I showed him the iPad," he said.
With secret service agents looking on disapprovingly, a cell phone video shows the moment when Cann made his move.
"I just wrote 'Mr. president sign my iPad,' and just something to show him very quickly, he could look down and understand and start signing," he said.
"I just ran my finger down it just to show him use your finger, just put your autograph on there, as soon as I did that he was onboard. He just took it from me and began signing his name," said Cann.
Cann isn't letting this high tech memento disappear anytime soon.
"I will put it up on the digital picture frame so I will always see I have the president's signature," he said.
For safety reasons the secret service does not allow people to bring pens near the president. Presidential aides say this is the first time the president has signed an iPad.