It is true that historically Jews have voted democratic, mainly because of social issues. Remember, secular Jews were on the forefront of civil rights. But nowadays, the trend has shifted among frum Jews. I am involved in local politics and can tell you that many more Orthodox Jews are now registering as Republicans. Possibly this is attributable to the Republican family values agenda compared to the Democratic agenda that favors abortion and gay rights. Additionally, Republicans have historically been much better for Israel.
However, I agree that discreet groups that rely heavily on government services, be they at the school district level or higher, will vote for the politicians who will give them what they need.