With "Fast and Furious" weapons.
Best case scenario for Obama: Anti-government extremists. And if they're white, this is how it'll be spun no matter what the motivation. (And the motivation could very well be anti-government extremism. I'm not blind to that reality. There's a lot of pissed-off people in the country right now.)
I zoomed in on an image of the SUV posted here on FR and the person lying on their back on the freeway appears to be a dark-skinned woman.