billt,
the easy explanation is that the youtube page of Gabrielle Gifford's listed in the video isn't hers, but made to look like hers, assuming she has a youtube page.
....OK, I just did some research. From her home page, there are youtube videos, and that account IS giffords2. Her page there shows 1 subscription, RepIkeSkelton.
Interestingly, it shows her Last Visit Date as 1 Day ago, after your video was posted, and after she was shot. I assume many of her aids have access to this account. Also comparing, her current youtube page stats from what video's page shows 11K vs 296K channel views now. And your posted video only has 1400 views. Subscribers to her page have also doubled.
So, interesting, but easily faked or hacked.