According to a convention source, it's Rep. Rahm Emanuel, the chairman of the House Democratic Caucus.
Emanuel will accompany Obama as the presumptive nominee meets privately with AIPAC's executive board.
In other news: Sen. Hillary Clinton told AIPAC convention attendees that Obama would be "good for Israel."
We want to hear what you think about this article. Submit a letter to the editor or write to email@example.com.