According to a story in The Recorder, Professors Mariano-Florentino Cuéllar and Mark A. Lemley are legal advisers to the Obama presidential campaign:

Leading Democratic candidate Barack Obama has come out on the issue of patent reform, touting higher quality "gold-plated" patents. Among his legal advisers­ which include UC-Berkeley School of Law dean Christopher Edley and Stanford Law School professor Mariano-Florentino Cuellar­ is Stanford law professor Mark Lemley, an IP expert. The campaign has also turned to Valley lawyer John Roos, making the Wilson Sonsini Goodrich & Rosati CEO the state finance co-chairman for the campaign and a voice in its tech policy group.