In New York, that distinction goes to the law firm of Boies, Schiller and Flexner who gave close to $700,000 to current members of the House and Senate from New York.

That firm was founded by David Boies, the super-lawyer who represented Al Gore during the 2000 recount and who has since been one of the lead lawyers attempting to over California's anti-gay marriage Proposition 8. Senator Kirsten Gillibrand, a frequent target of the firms' largesse, was also a partner there earlier in her career.

Ms. Gillibrand also spent time earlier in her career as an attorney with Davis Polk and Wardell, who happened to be the second-most generous donor to New York's delegation, pouring in over $400,000 to members of this Congress. One-time Congressional candidate Reshma Saujani also once counted the firm as her employer.

Rounding out the top five are New York Life, Goldman Sachs, and the law firm of Paul Weiss.