As has been reported here (and iterated elsewhere), Jews in the US--including Orthodox--are, on the whole, further to the left politically than white Democrats are. There are lots of varying explanations for this--Jews being yoked to the American left wing because "it represented the closest American counterpart to the forces on the left that had favored Jewish emancipation in Europe", a consequence of several centuries of urban concentration, as a vehicle for successfully pursuing a "group evolutionary strategy", and a long history of working with and for the state, just to run through a few.
Despite at least being aware of all of this, I was surprised to find how hostile Jews are towards restrictions on abortion. A recent Pew report headlined for cataloging increasing support for gun rights and same-sex marriage contains a seemingly orthogonal table at the end that tracks percentages of people who think abortion should be legal in all or most cases and those who think it should be illegal in all or most cases. Splitting 86%-11% in favor of legality, Jews are the most pro-choice of the 33 groups Pew breaks out; more so than those who have no religious affiliation, than liberal Democrats, and than those who seldom or never attend religious services.
Why? Perhaps it's as difficult for a gentile to understand this particular aspect of Jewish liberalism as it is for him to truly comprehend why the Jewish affinity for leftism generally is so strong, but the possibilities that crop up in my mind--that setting parameters on reproductive rights smacks of 'Nazism' (notwithstanding how odd a way this would be to express that), that Jewish fertility is in the toilet even though Jewish abortions are rare means that more abortions leads to a larger Jewish population share, or that the pro-life movement is preponderantly a white southern evangelical one and therefore something Jews instinctively oppose--feel kind of kooky.