Which led to Democrats loudly booing during the 2012 DNC when the Jerusalem language was reinstated.

Via Weekly Standard:

On Friday Colin Kahl was named Vice President Joe Biden’s national security adviser and deputy assistant to the president. Kahl previously served in the Obama administration as deputy assistant secretary of defense for the Middle East between 2009-2011, but is probably best known for his work outside of government—in particular, for advocating containment of a nuclear Iran, and for his part in trying to remove the recognition of Jerusalem as capital of Israel from the 2012 Democratic platform. […]

Meanwhile, Kahl was helping out in the drafting of parts of the 2012 Democratic party platform. As Josh Rogin and Ben Smith reported at the time, Kahl and Congressman Robert Wexler were responsible for altering the platform so that it omitted mention of Jerusalem as the capital of Israel, which represented a change in longstanding party policy. As one source told Rogin at the time: “Colin Kahl and Bob Wexler bear personal responsibility for the platform debacle and the embarrassment caused to the president and the party. … They led a secretive, exclusionary process, rather than an inclusive one, recklessly threw out the longstanding platform language, and then attempted to cover their tracks by misleading stakeholders about what they had done and with whom they had consulted.” Under pressure, the president had to overrule Kahl and put Jerusalem back in. But Democrats still paid a political price.