At the very least, the extremely wealthy.
Some examples:
[link|http://www.usnews.com/usnews/opinion/baroneblog/columns/barone_050817a.htm|http://www.usnews.co...arone_050817a.htm]
[link|http://www.cnn.com/2003/ALLPOLITICS/06/13/senators.finances/|http://www.cnn.com/2...enators.finances/]
Of the 40 millionaire senators, 18 are Democrates with a networth of $528 million and 22 are Republications with a net worth of $99 million.
Or look at the top contributors to 527's:
[link|http://www.opensecrets.org/527s/527indivs.asp?cycle=2004|http://www.opensecre...vs.asp?cycle=2004]
Soros and Lewis definitely don't support Bush.