There is a great ideological divide in America between conservatives and liberals over Israel. Despite this, 90% of American Jews support the liberal camp, which is generally hostile to Israel. So Democratic candidates typically play a game of mouthing pro-Israel bromides while undermining Israel in practice. (For a recent example, see Nancy Pelosi's Arab dictator tour, which was hailed by jihadists).
Another ploy is to show their real stripes only after retiring, like Jimmy Carter:
Carter Urges Iowa Voters Not to Back "Knee-Jerk Supporters" of Israel
As long as American politicians are seen as "knee-jerk supporters" of Israel, the country's role as the principal Mideast peace broker will be endangered, former President Jimmy Carter told a crowd Wednesday at the University of Iowa.
Carter told the crowd of 6,000 that he chose Iowa out of the 100 university lecture invitations he received because of the power of Iowa caucus voters to select candidates.
"The main reason I came to Iowa is to make sure you knew you could shape an outcome in the 2008 presidential election. At least you can screen out candidates," he said.
"Make them pledge to you...that they will take a balanced position between Israel and Palestinians."
Another example of a Democrat who only felt comfortable to show his true radical beliefs after leaving office was Lyndon Johnson's Attorney General,
Ramsey Clark.