(Charles Mann Photography)

Wealthy donors are once again putting record sums into U.S. politics, many of them through super political action committees that were made legal through the U.S. Supreme Court’s 2010 decision in Citizens United v. Federal Election Commission.

On the eve of Election Day, The American Lawyer examined FEC filings between early 2015 through late October to see which law firms are behind several of the largest so-called super PACs. Perhaps not surprisingly, Perkins Coie, a longtime legal advocate for Democratic Party causes, and Jones Day, counsel to Donald Trump’s Republican presidential campaign, are two of the most active firms racking up legal bills on behalf of the biggest super PACs.

Below are 18 of the largest super PACs operating this election cycle, along with the political cause they are backing, their largest benefactor, the location of their headquarters and the law firms that have billed them for legal services since 2015.

America Leads (Conservative – Alexandria, Virginia)

Squire Patton Boggs: $49,255

Jones Day: $43,866.20

Club for Growth Action (Conservative – Washington, D.C.)

Wiley Rein: $244,940.01

Baker & McKenzie: $12,778.92

Webster, Chamberlain & Bean: $756.25

Congressional Leadership Fund (Conservative – Washington, D.C.)

Wiley Rein: $182,257.40

Conservative Solutions PAC (Conservative – Tampa)

Foley & Lardner: $110,144.50

Freedom Partners Action Fund Inc. (Conservative – Arlington, Virginia)

Jones Day: $20,653.75

Future45 (Conservative/Sheldon Adelson/J. Joe Ricketts – Herndon, Virginia)

Jones Day: $137,110.45

Wiley Rein: $6,353.75

House Majority PAC (Liberal – Washington, D.C.)

Perkins Coie: $247,203.89

Independence USA PAC (Independent/Michael Bloomberg – Washington, D.C.)

Venable: $183,624.07

Make America Number 1 (Conservative/Robert Mercer – Port Jefferson Station, New York)

Renamed in June from Keep the Promise I, a super PAC backed by Mercer, a billionaire hedge fund investor. Bracewell and Greenberg Traurig—two firms affiliated with Trump supporter Rudy Giuliani (he took a leave of absence from the latter last month)—have been its primary legal beneficiaries, as noted by The Daily Beast.

Bracewell (formerly Bracewell & Giuliani): $336,495.32

Greenberg Traurig: $185,536.76

Dentons: $3,548.28

New Day For America (Conservative – Columbus, Ohio)

Baker & Hostetler: $329,609.52

NextGen Climate Action Committee (Liberal/Tom Steyer – Washington, D.C.)

Perkins Coie: $558,599.30

Our Principles PAC (Conservative – Alexandria, Virginia)

King & Spalding: $105,601.09

Wiley Rein: $7,866.16

Priorities USA Action (Liberal – Washington, D.C.)

Covington & Burling: $494,533.51

Perkins Coie: $90,000

Brown Rudnick: $135,789.95 (rent paid to firm for office space)

Rebuilding America Now (Conservative – Alexandria, Virginia)

Foley & Lardner: $96,112.24

Hale Westfall: $66,035

Right To Rise USA (Conservative – Los Angeles)

Clark Hill: $562,247.02

Senate Leadership Fund (Conservative – Warrenton, Virginia)

Holtzman Vogel Josefiak: $42,100.86

Senate Majority PAC (Liberal – Washington, D.C.)

Perkins Coie: $306,179.60

Stand for Truth Inc. (Conservative – Lexington, Kentucky)

Dinsmore & Shohl: $109,207