Quote from an email from Dan Irons:
In the “states” dataset, state populations appear to have been misassigned. For example, the populations of Alaska and Alabama have been transposed, likewise the populations of Arkansas and Alabama, and so on with each pair of states on down the list (although I haven’t checked every row). I haven’t looked at the package source to determine where the errors are introduced, and of course it is entirely possible that the errors were inherited from the data sources that you took the data from.
Quote from an email from Dan Irons: