Because left-wing, socialist-marxist-commie demoRAT ideology will ALWAYS win out over blood, race, creed, color, family, religion, etc. That's why liberals & blacks could pelt Michael Steele with oreo cookies or call Condi Rice "Aunt Jemina" along with cartoons of her, and there's not a hint of outrage or condemnation from the mainstream deranged media. It's why Clarence Thomas is reviled by the same 98% dumber than dirt blacks who worship & voted for 0bozo. It's why so called orthodox & blue collar Catholics will vote for demoRAT politicians who love to kill babies, promote homosexuality & lesbianism, destroy & kill jobs in this country, raise taxes & spending to astronomical levels but still get the votes from >50% of Catholics.
And back to the question of why liberal dumb-ass Jews vote 78% for 0bozo & the demoRATs is because they are f__kin leftist morons who would pull the lever for 0bozo & the demoRATS even as they are being herded onto trains to take them to socialist-Amerikan gas chambers. Liberal Jews hate America because America was founded on Biblical Christian values & principles. Jesus said not to be surprised that the world will hate us because it hated him first. And finally liberal American Jews actually hate Israel because Israel is reminder to them of the fact that Bible prophecy was fulfilled with the re-gathering & establishment of Israel as a nation in 1948, and that God is not yet done working through & with the nation of Israel in Ezekiel 38-39, Daniel & Revelation. Liberal Jews are for the most part atheistic and antagonist towards Israel, and would rather see Israel driven into the sea & exterminated by the muzzlims.
Liberal, leftist ideolgy & agenda will ALWAYS trump anything else for liberal morons.
Historically in Old Testament times down through the ages until now, when the Jews lost sight of their Friend, they tried to make friends with those that hated them who sooner or later would always try to destroy them.
They have a Friend. They just don't yet realize it. They will soon.