of the constituency.
Larger districts = less representation and more dumb congressman.
Smaller districts = more responsive and easier to vote out congressman.
Right now only 435 people can go to Congress. Not too much chance of getting a responsible Representative. With districts so large that you have to appeal to the lowest common denominator to win them the Candidate will not have the first clue about the Constitution.
With districts of only 50,000 as apposed to 500,000 or even 1 million in some states, you would have over 6,000 representatives and a far greater chance that a larger proportion would have a clue, or else face a much easier defeat in 2 years.