Former Vice President Joseph Biden led top Democratic presidential candidates in legal spending between July and September, shelling out almost $350,000 to Covington & Burling and a handful of other firms his campaign hired in recent months, according to a disclosure filed late Tuesday.

In the quarter ending Sept. 30, Biden’s campaign paid Covington more than $250,000, after paying the firm almost $70,000 in June. Robert Lenhard, a Covington partner and former chairman of the Federal Election Commission, is leading the firm’s work for the former vice president. In 2008, Lenhard oversaw the transition team that reviewed the FEC for the incoming Obama administration.