I believe that the problem is with the definition of the “liberal”. This is a gross misnomer to call Pelosi, Reid, Van Jones, Rahm, ACORN members, etc. liberals. What is so liberal about their ideology? Forced unionization of labor? Stiffling the discussion about Anthropogenic Global Warming? Muzzling of opposition? Nationalizing banks and industry? Support of 3-rd world dictators? Election fraud? Lying media?
Support of democratic criminal members of Congress and Senat?
I believe the above list of questions can be very long.
On the other hand many of the above issues are squarelly on the leftist agenda. So if we rename these liberals as leftist, the question “Why So many Jews tend to lean/support left?” will become very perplexing.