It must be tough to be a delegate at the Democratic National Convention–you have to know when to scream for Hillary, when to scream for Obama and when not to scream at all. And then you have to learn the art of shaking hands and networking while listening for really important announcements such as someone somewhere offering free pizza. Life may be easier if you have a swanky cellphone. At least, that’s what a bunch of companies are trying to convince you as they push their mobile-related products in Denver.

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