What, did you expect her to go all Max Cleland on her votes? Look where that got him?
Funny thing is, that was the last race in recent history where an incumbent of the out-of power party lost re-election in a midterm year. Looks like Heitkamp will join that unfortunate group
2002 doesn't count, Bush had artificially high approvals at that point. In many ways 2002 was more Presidential than 2000 in outcome by modern standards. In which case, the outlier was Mark Pryor.
A better example would be 1998, when Indiana flipped D while the GOP picked up lots of places.