Agents enter dual agency when they represent both the seller and the buyer. Dual agency can happen even if the there are two agents involved -- a listing agent and a buyer's agent -- if both agents work for the same broker. That's because it is the real estate broker who creates agency.
The notion of Jewish control of the United States is utter nonsense. Jews are a capable people who have, through hard-work, gained a disproportionate role in some aspects of American life. But they in no way dominate the country.
If that were the case, then there are a few ways to express an answer to the question: -- One way to look at it: Jews constitute 2.1% of the total US population. We're assuming that 59.8% of all Jews are registered to vote. So Jews registered to vote constitute 59.8% of 2.1% of the total US population, or about 0.013 of the total population. -- The other way: The Jewish population of the USA at the end of 2011 was estimated at 6,588,065 .