From the NY Observer Jason Horowitz's profile of a trio of New York Democratic consultants, one of whom is Josh Isay:
Mr. Isay, a former chief of staff to Mr. Schumer, runs Knickerbocker SKD, which he founded in 2002 and made a fortune from after scoring Mr. Bloomberg as a client. They also have counted among their clients Mr. Stringer; District Attorney Robert Morgenthau; a handful of City Council candidates; and unions, including the powerful 1199 SEIU. Mr. Isay did campaign mail for Barack Obama in New Hampshire and North Carolina during the general election. In 2006, he worked on Joe Lieberman’s general election in Connecticut, and in 2008 made television spots for Benjamin Netanyahu in Israel. This year, his firm counts as clients Manhattan district attorney candidate Leslie Crocker Snyder (who Mr. Isay’s former client, Mr. Morgenthau, despises) and comptroller candidate David Yassky, whom Mr. Isay helped crush in a 2006 bid for Congress when he worked for Yvette Clarke, now a representative. [Emphasis added.]
That bolded sentence serves as a nice reminder of the, uh, broad-mindedness you need to be a successful political operative.