Well.....
Despite popular stereotypes of Republicans as the party of the rich and Democrats as the party of the working class, the wealthiest member of the Senate (John Kerry of Massachusetts) and the wealthiest member of the House (Jane Harman of California) are both Democrats. Of the top six wealthiest senators, five are Democrats.
John Kerry, D-Massachusetts: $163,626,399
Herb Kohl, D-Wisconsin: $111,015,016
John Rockefeller, D -West Virginia: $81,648,018
Jon Corzine, D-New Jersey: $71,035,025
Dianne Feinstein, D-California: $26,377,109
Peter Fitzgerald, R-Illinois: $26,132,013
Frank Lautenberg, D-New Jersey $17,789,018
Bill Frist, R-Tennessee: $15,108,042
John Edwards, D-North Carolina: $12,844,029
Edward Kennedy, D-Massachusetts: $9,905,009
disclaimer: this info is from 03 I think... looking for updated numbers