Comment: Nearly any category of employment

will produce similar lopsided results. Romney has plenty of money, but it is all pulled out of a few narrow constituencies like banking.

Make the chart of donations from:

military
telecom
restaurant workers
truck drivers
brain surgeons
anybody.

For almost any of these, Ron will have way more donations! Just because he has many times more individual people who contribute.

I'm not sure how to identify niches of contributors, but I'll bet you could do this with almost any of them.