First it was Huckabee, then Hillary, and now it's just a big joke.
This is someone named Liz Trotta from earlier today who first referred to Obama as "Osama" and then laughed that they should both be killed. Here's a longer clip for more context. H/T Scarce.
Update: Liz Trotta apologizes:
That's exactly what needed to be said. Good for her. The Clinton campaign would do well to watch this. Words like "I am so sorry" and "I sincerely regret it and apologize to anybody I've offended." go a long way to diffuse this kind of thing.