Now, no one could have reasonably faulted her had she replied "Oh, ya know, that one a few years back where they said ya could lose yer home if, ya know, if the city wanted it for a shoppin' mall or somethin', you betcha!" without being able to identify it as Kelo v. City of New London. But it's quite clear from the embedded video that she was unable to think of a single case, and unwilling to acknowledge the fact. Instead she attempted to bluff her way past it.
I find this one point of common ground with many of her partisans: let Sarah be Sarah! Let her have "unfiltered" exposure to the Teeming Millions. For example, the CNN transcript of Thursday night's "debate" can be found here. Find the text string "Iran and Pakistan," and compare the candidates' responses on the issue. Biden doesn't do as well as he did addressing the same issue in one of the primary debates, but Palin is simply incoherent.