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“The greatest challenge of our time,” Representative Ro Khanna of Fremont said, “is the concentration of economic opportunity by geography.”

Mr. Khanna, a 41-year-old patent lawyer, is a first-term congressman from the 17th District of California, in the heart of Silicon Valley. He’s a self-avowed tech junkie who’s drawn support from the industry’s top players.

Yet he’s joked that his district has some of “the biggest egos known to humankind” and he is adamant that Silicon Valley is too exclusive, hardly diverse enough and benefits far too few.

“Tech needs to do better,” Mr. Khanna, a Democrat, said on Thursday. “The achievements here are staggering, but the question is who is participating. I would argue that a lot of people have been left out: African Americans and other minorities and people in rural areas of the heartland of our country.”