See here:
Eliot Abrams writes in an op-ed in the Wall Street Journal (What is Israel’s Capital? Democrats Have Trouble Saying):
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Among the Democratic committee members this year were Newark Mayor Cory Booker, Massachusetts Rep. Barney Frank, former Florida Rep. Robert Wexler, Massachusetts Gov. Deval Patrick, and former Ohio Gov. Ted Strickland.
None of these people are strangers to Barack Obama and no doubt were quite aware of his priorities and policies - and agenda going forward.
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It was only when blowback occurred that could hurt his political prospects that he stepped forward and inserted the language to assuage critics.