Well, the plain fact is that in certain parts of certain Cities there is danger just getting out of your car to pump gas. The other, omitted fact in this piece is that the perpetrator has about a 90% chance of being Black and the victim is also likely to be a Black.
Taking her statement literally she is saying that Obama's greatest risk comes from other Blacks and not some White KKK type.
That was my first thought also -- then I remembered that these two are very high-income people. They are not living in a tenement and likely had never lived in such surroundings.
What did she really mean? Apparently the statement was in response to the question, are you concerned about the possibility of your husband being assassinated?
It is IMO accurate to say that the gas station answer was a way of saying "No because life is full of danger for some." It was an impromptu remark that conveyed her feelings about matters (plural).
To wit, it also tends to reveal her thinking on race relations, even for her at her economic level. Even if she answered for "the typical black man in a high crime area" her husband is no "typical black man" and in no way faces those day-to-day dangers.
So, in her upper class, mostly white free-of-persistent-crime neighborhood how should going to the gas station be more dangerous for a black man than for a white man? Is she saying that like "the typical black man in a high crime area" her husband faces the same danger in a mostly white free-of-persistent-crime neighborhood? If so, why so? Only one answer IMO, he's black and almost everyone else is not.