Thank God! And yes, in every religion there are liberals. It just strikes most people as curious as to why many Jews continue to support liberals and anti-Israel policies.
I think that a big part of it is the high value that Jewish families have historically placed on education. The fact that most institutes of "higher learning" are infested with leftists, the more time spent with them, the greater chance that it will rub off.
Another possibility is the string belief in charity and "Tikkun Olam," AKA "Heal the World." Both have often been misunderstood (in my personal belief) by well meaning Jews. They often believe that if one person can do good, then a bunch working together can do better. So why not just have the government take care of it, since that way EVERYBODY is helping out.
Mark