Lawyers/Law Firms:
Long-Term Contribution Trends
Opensecrets.org--Money in politics data (Lots of donor info by industry - I highly recommend it.)

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I am an American. That's the way most of us put it, just matter of factly. They are plain words, those four: you could write them on your thumbnail, or sweep them clear across this bright autumn sky. But remember too, that they are more than just words. They are a way of life. So whenever you speak them; speak them firmly, speak them proudly, speak them gratefully. I am an American. ...a tradition