So -- from this article -- it appears that the propagation expected on the AM band will be a bit different then one would normally think, i.e. it's apparently more important that the target station is located in the path of darkness than the receiver being located in the path of darkness. Cool.
There's a swath of Oregon, Idaho, and Wyoming stations that just might be audible here where I live, depending on how strongly the eclipse affects their signals. Maybe KEX, KPNW, a few Salem and Oregon Coast stations, and possibly a couple in E. Oregon (there are a couple there that are usually audible here at night, even though they are 5 kW stations). I'll have my PR-D5 and Superadio switched on for sure.