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.