You say that many older Jews have a problem with Obama. 

 In general, Obama gets more support from the young and relatively little support from the old.  Do you have any numbers showing that Obama's "old Jewish" support is even thinner than his "old" support among all religions?   I would think before spending so much time analyzing "serious rumblings" you would find an exit poll or two that shows the rumbling has any substance to it.  

--Z