I'm a bit confused.
I typed in George Soros, and it says he's at most contributed 5.7 million dollars. Surely it's more than that.
That's just to candidates.
Like AUT1 said, this guys funds 100's of millions to socialist organizations and think tanks. Moveon.org, Huffington Post, Acorn, Media Matters, Planned Parenthood. You name it.
FWIW - Top DC lobbyists/donors the last 20 years:
Of the top 18 - 15 are democrat, 1 republican, 2 neutral.
Like wench said, the top 10/15 is littered with Unions for the most part. Also in the top 10 are AT&T, ActBlue (#1) and AAJ (formely the Trial Lawyers Association). The AMA is not nearly as high as SOME (Obama) like to make voters think. Unions, thinktanks and lawyer "clubs" are much higher in amount lobbied than the AMA.
http://www.opensecrets.org/orgs/list.php