This gives a sort of natural ombudsman to the House. At-large reps are commonplace outside Congress. Seems like a good idea.
This and some other features here mean that in every election Joe Voteur votes for 5 federal officers; President, AL Senator of the currently changing Senate class, the one at-large Rep, your current class Senator, and your local Rep. You don't vote for VP any more. I suppose most presidential candidates will announce their VP during the campaign.