More states should adopt electoral vote allocation by CD. Makes things interesting.
Nebraska and Maine have some justification because the two districts are different.
Gerrymandered districts intended to alter the partisan basis of representation in Congress could be construed to distort the popular vote. Congressional districts are usually seen as arbitrary entities with no other legal significance.
Would any elections outcomes have changed if every state went to CD allocation? I think 2000 wouldn't have.
I'm too lazy to compile this, though so...