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He defeated a crowded field that included social media influencer Kat Abughazaleh, a Palestinian American who is a more vocal critic, as well as AIPAC's preferred candidate, state Sen. Laura Fine. Biss is now favored to win the general election in the heavily Democratic district.

The race had become one of the country's most closely watched Democratic primaries, in large part because of AIPAC's involvement in a district whose population is more than 10 percent Jewish and which has had a Jewish representative for more than 60 years.