It's one thing to read about an event in the newspaper; it's another thing to watch the event in its unexpurgated form as raw, unedited video. And as more people carry video cameras or video-enabled mobile phones, it's a safe bet that high-, medium- and even low-visibility political events are going to be recorded by participants and find their way to the web. Not every video will be a "macaca" moment, but these primary documents have their own power to persuade or affect opinions precisely because they're so organically real. Such is the case with Barack Obama's appearance yesterday at a Boca Raton synagogue