Not long ago, if a U.S. presidential hopeful from either party was mounting a serious bid for the Oval Office, the candidate would seek a spot on the main stage at the American Israel Public Affairs Committee (AIPAC) policy conference, the largest U.S. gathering of the pro-Israel lobby. This year, it seems, not so much. While the 2019 speakers list was stacked with officials from President Donald Trump's administration and Republican Party grandees, most major Democratic presidential candidates for 2020 were missing from the conference altogether.