Jewish doesn't equal unquestioning support for Israel though, there are lots of, especially young, Jewish people in the US that don't support an attempted genocide.
I think he is trying to walk a line though, don't piss of the pro Israel crowd too much, don't piss off the pro Palestinian crowd too much. Ultimately though he will always support Israel, the US don't fund Israel every year out of the goodness of their hearts. I don't think the US have ever particularly cared about Israel just their position in the middle east.