'Control' is the wrong term. Rich doners representing any lobby can have a high degree of influence under the right conditions - with Israel the conditions are almost always right due to the factors I mentioned above.
Contrast with, say, rich Arab doners representing Gulf states - for now they can buy a lot of influence in Washington due to various factors, but they can never buy the level of sympathy that Israel continues to draw across America. The day their funds/oil runs out, their influence on American policy will immediately become severely limited.