I'm generally not a fan of these sorts of videos--you can never tell what they mean, because you don't have much context. What percentage of GOP congressmen actually are scared of the birthers? Is media just honing in on a few? You can't really tell.
That being said, watching a dude sprint away from the reporter was interesting. More interesting was the dude at the end who stood his ground, slammed Obama, and then said he was clearly born in Hawaii and clearly a citizen.
I'm tempted to say that this is the sort of issue that creates a lot of noise, but actually doesn't have much of a following. But measuring it against the contraction in GOP party ID, you can't really be sure.