ENRON TIES

The energy giant has long been Vinson & Elkins' top client. Last year, it accounted for more than 7% of V&E's $450 million in revenue. Managing Partner Joseph Dilg is a key contact for the Enron account. Enron's general counsel, James V. Derrick Jr., is a former V&E partner. Several other members of the legal department also hail from Vinson & Elkins.PRESIDENTIAL TIES

V&E gave the Bush campaign $190,000, making the firm his second-largest donor. White House Counsel Alberto Gonzales is a former partner in V&E's corporate department.

Data: BusinessWeek, American Lawyer