".....understand why"
It is a mystery.
I must confess I cannot understand how anyone can vote for Obama a second time, especially Jews.
Jews don't trust the motives of republicans so they will RARELY pull that lever. Where that comes from I don't know, especially if you stack them up against today's democrats.
For example, if you look at the record, the supporters of Israel are republicans, not democrats. But American Jews don't seem to care.
I guess the best thing you can say from a voting perspective is that they are only 2% of the voting population.